Select the option that expresses the given sentence in the active or passive voice.

Fifteen children were rescued from an unregistered home by the police.

The police rescued fifteen children from an unregistered home.

The correct option that expresses the given sentence in the active voice is The police rescued fifteen children from an unregistered home.

The other options are incorrect because:

• Fifteen children were rescued from an unregistered home by the police is in the passive voice.
• Fifteen children rescued the police from an unregistered home is grammatically incorrect. The subject of the sentence is "fifteen children," but the verb "rescued" is in the active voice, which means that the subject is the one doing the action.
• The police were rescued fifteen children from an unregistered home is grammatically incorrect. The subject of the sentence is "the police," but the verb "were rescued" is in the passive voice, which means that the subject is the recipient of the action.
• The police have rescued fifteen children from an unregistered home uses the present perfect tense, while the original sentence is in the simple past tense.