Answer and explanation

Correct answer: C. The cake was eaten by the dog.

  1. Step 1: In the passive voice the subject receives the action.
  2. Step 2: Here the cake (the subject) was eaten by the dog.
Answer
The cake was eaten by the dog.
Why not the others: In the other sentences the dog is the subject doing the action, so they are active.

Practise more Spelling, Grammar, Punctuation and Vocabulary.

Free questions with an explanation for every one, and full timed 11+ Practice (England) mock tests.