(A) The enemy was defeated by our army.
(D) The enemy have been defeated by our army.
(B) The enemy had been defeated by the army.
(C) The enemy has been defeated by our army.
🧠 Explanation:
For “Our army has defeated the enemy,” the passive voice is “The enemy has been defeated by our army.” Voice changes shift focus in English sentences. In Pakistan, they’re used in reports or news to emphasize actions, ensuring clarity in formal writing or journalism.