In the following question, a sentence has been given in Active/Passive Voice.…

Answer: Was the person responsible for the blasts caught?

Explanation

• Identify subject and object in the active sentence: Active sentence: 'Did they catch the person responsible for the blasts?' Subject (agent): they. Object: the person responsible for the blasts.

• Form the passive question for past simple: 'Did + subject + verb' becomes 'Was/Were + subject (the active object) + past participle'. Choose 'was' or 'were' based on the new subject's number.

• Apply to this sentence: 'the person responsible for the blasts' is singular → use 'was'. The verb 'catch' in past becomes past participle 'caught'. Therefore: 'Was the person responsible for the blasts caught?' (Optionally add 'by them' to show the agent.)

Why the other choices are incorrect

• The sentence asking 'Are they close to catching the person responsible for the blasts?' uses present progressive and asks about ongoing progress, not whether the action was completed in the past.

• The declarative with a tag 'The person responsible for the blasts was caught, wasn't he?' changes the tone to seeking confirmation and is not the direct interrogative passive form expected.

• The phrase 'Do they caught the thief responsible for the blasts?' is ungrammatical (mixes 'do' with past 'caught') and introduces the word 'thief', which is not in the original sentence.