Question

We use Passive voice when...

The subject is not the doer of the action and we put the reciever as the subject.
The verb is the subject of the action and the subject is the reciever of the sentence.
The reciever of the action is the complement and the subject is the doer of the action.

Answer 1

La opción correcta es la primera:

En la voz pasiva, el sujeto no es el agente (quien realiza la acción) sino que es el receptor de la oración.

Saludos!