Select the option that expresses the given sentence in passive voice.
The surgeons were operating on a defective heart in the operation theatre.

Correct option is A

The correct passive voice of the given sentence is "A defective heart was being operated on by the surgeons in the operation theatre."
Explanation:
· The original sentence is in past continuous tense ("were operating").
· In passive voice, "was/were + being + past participle" is used.
Structure:
· Active: The surgeons (subject) were operating (verb) on a defective heart (object).
· Passive: A defective heart (object) was being operated on (verb) by the surgeons (agent).
Incorrect Options:
· (b) Will have been operated – Incorrect tense (future perfect).
· (c) Was operated – Incorrect; changes past continuous to simple past.
· (d) Has been operated – Incorrect; present perfect doesn’t match the original tense.