Choose the option in which VOICE in the above sentence has been correctly changed into Passive Voice.
The cat killed the rat.

Correct option is D

The correct passive voice of the given sentence is (d) The rat was killed by the cat.
• The given sentence is in Simple Past Tense (“killed”).
• While changing active to passive, the tense must remain the same.
• In Simple Past Passive, we use: was/were + V³.
• The object “the rat” becomes the subject in passive voice.
Grammatical rule used (English):
Active Voice (Simple Past): Subject + V² + Object
Passive Voice (Simple Past): Object + was/were + V³ + by + Subject
Grammatical rule used (Hindi):
• Simple Past Tense में Passive बनाते समय संरचना होती है: was/were + क्रिया का तीसरा रूप (V³)।
• Active से Passive बनाते समय object को subject बनाया जाता है और कर्ता (doer) “by” से आता है।
• tense (काल) नहीं बदलता।
Example:
Active: The teacher punished the boy.
Passive: The boy was punished by the teacher.
Why other options are incorrect:
• (a) Meaning and structure are incorrect (active sentence formed wrongly).
• (b) Past Perfect Passive (had been) — tense changed.
• (c) Present Perfect Passive (has been) — tense changed.