Which structure indicates a passive voice construction?

In passive voice constructions, the focus shifts from the subject performing an action to the subject receiving the action. The typical structure of a sentence in passive voice involves the object of an action becoming the subject of the sentence, which is typically preceded by a form of the verb "to be" followed by the past participle of the main verb.

The choice that indicates this construction is when the verb comes before the subject and object, which aligns with how passive sentences are formed. In a passive voice sentence, it's common to see a structure where the action's recipient is mentioned before the doer, highlighting the effect of the action rather than the action itself.

For example, in the sentence "The cake was eaten by the children," "the cake" (the object) is now the subject of the sentence, and the structure emphasizes what happened to it rather than who performed the action.

In contrast, the other structures reflect either active voice constructions or variations that do not align with the defining characteristics of passive voice. Thus, the structure involving verb preceding the subject and object suitably illustrates the concept of passive voice.