Select the correct passive form of the given sentence.

The villagers have rebuilt the hospital.

The hospital has been rebuilt by the villagers.

The correct passive form of the given sentence is The hospital has been rebuilt by the villagers.

The active voice of the sentence is The villagers have rebuilt the hospital. 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 "hospital" and the main verb is "rebuild." The past participle of "rebuild" is "rebuilt." So, the passive form of the sentence is The hospital has been rebuilt by the villagers.

The other options are incorrect because:

• The hospital was rebuilt by the villagers. is also in the present perfect tense, but the present perfect tense with "has" is more appropriate because the rebuilding of the hospital is still relevant to the present.
• The hospital had been rebuilt by the villagers. is in the past perfect tense, which is used to describe an action that happened in the past before another action happened. There is no other action mentioned in the sentence, so the past perfect tense is not appropriate.
• The hospital has rebuilt by the villagers. is grammatically incorrect. The verb "to rebuild" needs to be in the past participle form, which is "rebuilt."
• The villagers have rebuilt by the hospital. is grammatically incorrect. The subject of the sentence should be the one who is being affected by the action, which is the hospital.