Select the correct passive form of the given sentence.

The police have apprehended the criminal.

The criminal has been apprehended by the police.

The correct passive form of the given sentence is The criminal has been apprehended by the police.

The active voice of the sentence is The police have apprehended the criminal. This sentence is in the present perfect tense, which is used to describe an action that has happened in the past but is still relevant to the present. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "the criminal" and the main verb is "apprehend." The past participle of "apprehend" is "apprehended." So, the passive form of the sentence is The criminal has been apprehended by the police.

The other options are incorrect because:

• The criminal had been apprehended by the police. is in the past perfect tense, which is used to describe an action that had happened in the past before another action happened. The action of apprehending the criminal is not something that had happened before another action happened.
• The criminal had been apprehend by the police. is grammatically incorrect. The verb "had been" is singular, but the subject of the sentence, "criminal," is plural.
• The criminal was apprehended by the police. is in the past simple tense, while the original sentence is in the present perfect tense.