Standalone Spinners on expandable android studio list

Good morning, I'm starting to work with expandable lists but I run into the following problem:

1. I have the following expandable list

When clicking on one of the questions, this question is displayed with a spinner to select the correct answer

The problem is that when you instantiate all the questions from the same .xml object When selecting an option of the spinner, the same option is selected in the other spinner of each question, I would like to know how I can make these elements independent.

xml question

<TextView
    android:id="@+id/txtPreguntaEst"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:text="TextView"
    android:textSize="18sp"
    android:textStyle="bold|italic"
    tools:layout_constraintTop_creator="1"
    android:layout_marginTop="16dp"
    tools:layout_constraintLeft_creator="1"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginLeft="16dp" />

<TextView
    android:id="@+id/txtRespuesta1Est"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:text="TextView"
    tools:layout_constraintTop_creator="1"
    android:layout_marginTop="79dp"
    tools:layout_constraintLeft_creator="1"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginLeft="16dp" />

<TextView
    android:id="@+id/txtRespuesta2Est"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:text="TextView"
    tools:layout_constraintTop_creator="1"
    android:layout_marginTop="26dp"
    app:layout_constraintTop_toBottomOf="@+id/txtRespuesta1Est"
    tools:layout_constraintLeft_creator="1"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginLeft="16dp" />

<TextView
    android:id="@+id/txtRespuesta4Est"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:text="TextView"
    tools:layout_constraintTop_creator="1"
    android:layout_marginTop="25dp"
    app:layout_constraintTop_toBottomOf="@+id/txtRespuesta3Est"
    tools:layout_constraintLeft_creator="1"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginLeft="16dp" />

<TextView
    android:id="@+id/txtRespuesta3Est"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:text="TextView"
    tools:layout_constraintTop_creator="1"
    android:layout_marginTop="23dp"
    app:layout_constraintTop_toBottomOf="@+id/txtRespuesta2Est"
    tools:layout_constraintLeft_creator="1"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginLeft="16dp" />

<View
    android:id="@+id/view"
    android:layout_width="0dp"
    android:layout_height="2dp"
    android:background="@color/blueShine"
    tools:layout_constraintTop_creator="1"
    tools:layout_constraintRight_creator="1"
    tools:layout_constraintBottom_creator="1"
    app:layout_constraintBottom_toBottomOf="@+id/textView16"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginTop="33dp"
    tools:layout_constraintLeft_creator="1"
    android:layout_marginBottom="33dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="@+id/txtRespuesta4Est" />

<Spinner
    android:id="@+id/spnComun"
    android:layout_width="100dp"
    android:layout_height="0dp"
    android:layout_marginStart="6dp"
    android:entries="@array/opcionesRespuestas"
    tools:layout_constraintTop_creator="1"
    tools:layout_constraintBottom_creator="1"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginTop="16dp"
    app:layout_constraintTop_toBottomOf="@+id/textView16"
    tools:layout_constraintLeft_creator="1"
    android:layout_marginBottom="6dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginLeft="6dp" />

<TextView
    android:id="@+id/textView16"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Slecciona la respuesta correcta"
    tools:layout_constraintTop_creator="1"
    tools:layout_constraintBottom_creator="1"
    android:layout_marginStart="5dp"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginTop="51dp"
    tools:layout_constraintLeft_creator="1"
    android:layout_marginBottom="46dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintTop_toTopOf="@+id/txtRespuesta4Est"
    android:layout_marginLeft="5dp" />

This is the event when you display the list

@Override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
    final String cadenaPregunta = (String)getChild(i,i1);
    if(view == null)
    {
        LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.activity_presentacion_pruebas,null);
    }
    String [] pregunta = cadenaPregunta.split(",");




   txtPregunta = (TextView) view.findViewById(R.id.txtPreguntaEst);
    txtPregunta.setText(pregunta[1]);

    txtRespuesta1 = (TextView) view.findViewById(R.id.txtRespuesta1Est);
    txtRespuesta1.setText(pregunta[2]);

    txtRespuesta2 = (TextView) view.findViewById(R.id.txtRespuesta2Est);
    txtRespuesta2.setText(pregunta[3]);


    txtRespuesta3 = (TextView) view.findViewById(R.id.txtRespuesta3Est);
    txtRespuesta3.setText(pregunta[4]);


    txtRespuesta4 = (TextView) view.findViewById(R.id.txtRespuesta4Est);
    txtRespuesta4.setText(pregunta[5]);



    return view;
}

I hope it was clear, thank you very much