Correct Answer: The neighbours have called the police.

Solution : The correct choice is the first option.

Active voice emphasises the doer of the action, while passive voice emphasises the receiver. In the first sentence, the subject performs the action, where the subject is "the neighbours" and the object is "the police".

It follows the structure of the active voice in the case of the present perfect tense, i.e., "Plural subject + have + past participle form of the verb + object."

The other options are in passive voice or have a different structure.

Therefore, the correct active structure of the given sentence is: "The neighbours have called the police."