Choose the correct answer from the given options –
Why did they pull down the building? (Change the voice)

Correct option is D

The correct passive voice form of the sentence "Why did they pull down the building?" is (d) "Why was the building pulled down?"
Active Voice: It denotes that the noun or pronoun that acts as the subject in the sentence is the doer of the action. In other words, the subject performs the action expressed by the verb. Passive Voice: It represents that the subject is one acted upon by the action or verb in the sentence. It can also be said that the passive voice indicates that the subject in the sentence is no longer active but passive.
The original sentence is in the simple past tense, active voice. When changing to passive voice:
• The object "the building" becomes the subject of the sentence.
• The verb form changes from "did pull" to "was pulled," maintaining the past tense.
• "They" as the doer of the action is omitted because it is often not necessary to mention in passive constructions unless specifically required.
Example:
Active: They pulled down the old theater last week.
Passive: The old theater was pulled down last week.