Which of the following sentences is written in the active voice?

The sentence "The children ate the cake" is written in the active voice because the subject of the sentence, "the children," performs the action of eating. In active voice constructions, the subject typically comes before the verb and directly engages in the action described, which in this case is the act of eating. This sentence clearly attributes the action to its doer, making it straightforward and concise. Active voice is generally preferred in writing when clarity and directness are desired. The other sentences illustrate the passive voice, where the subject receives the action rather than performing it.