Select the option that expresses the given sentence in active voice.
The batteries in the smoke detector have been changed.

Correct option is D

✔️ Correct option: (d) Someone has changed the batteries in the smoke detector.
· Definition of Voice:
· Passive Voice: The subject receives the action (e.g., The batteries have been changed).
· Active Voice: The subject performs the action (e.g., Someone has changed the batteries).
· Explanation:
· The passive sentence is in present perfect tense (“have been changed”).
· The correct active form is: has + V3 with a clear subject (Someone).
· Grammatical rule used:
· Passive (Present Perfect): Object + has/have been + V3
· Active: Subject + has/have + V3 + object
· Hindi Explanation: Present perfect passive को active में बदलते समय “has/have been + V3” को “has/have + V3” में बदलते हैं और subject जोड़ते हैं।
· Meanings of all the other options:
· (a) – Past perfect tense; incorrect
· (b) – Present perfect continuous; mismatched tense
· (c) – Simple past tense; wrong verb form for “have been changed”