Select the option that is the passive form of the given sentence.

The police brought a search warrant when they raided his house.

A search warrant was brought by the police when they raided his house.

The correct passive form of the sentence "The police brought a search warrant when they raided his house" is A search warrant was brought by the police when they raided his house.

The other options are incorrect because:

• A search warrant was brought when they raided his house by the police places the preposition "by" before the subject of the sentence, which is not grammatically correct.
• The police had raided his house and brought a search warrant is in the active voice, not the passive voice.
• A search warrant had been brought when the police raided his house uses the past perfect tense, while the original sentence is in the simple past tense.