Change the following sentence to a passive one: "All his relatives approved of his decision."

Correct option is C

The correct answer is (c) because the verb "approved of" is a phrasal verb, and in passive voice, the preposition "of" must remain intact. The sentence is in the past tense ("approved"), so the passive form uses "was approved of."
· Active Voice: All his relatives approved of his decision.
· Passive Voice: His decision was approved of by all his relatives.
The subject ("All his relatives") becomes the agent, while the object ("his decision") becomes the subject in the passive voice.
Information Booster:
· When converting to passive voice, the object of the active sentence becomes the subject of the passive sentence.
· Phrasal verbs (like "approve of") retain their prepositions in the passive form.
· The auxiliary verb ("was") reflects the tense of the original sentence.
· The agent is introduced by the preposition "by" in passive sentences.
· Passive voice emphasizes the action or the recipient rather than the doer.