Correct Answer: Why have the Delhi borders been sealed by the Chief Minister?

Solution : The correct passive form of the given sentence is the second option.

Explanation :

Passive voice is the voice in which the object experiences an action rather than the person who performs the action. Hence, the object in the active voice becomes the subject in the passive voice.

The structure of the interrogative sentence in the passive voice is, why + have + object + been + past participle form of the verb + by + agent of the action?

Therefore, the correct sentence is: Why have the Delhi borders been sealed by the Chief Minister?