Select the correct passive form of the given sentence. The child locked the shutters.

The shutters were locked by the child.

The correct passive form of the given sentence is The shutters were locked by the child.

The active voice of the sentence is The child locked the shutters. This sentence is in the simple past tense, which is used to describe an action that happened in the past. 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 child" and the main verb is "lock." The past participle of "lock" is "locked." So, the passive form of the sentence is The shutters were locked by the child.

The other options are incorrect because:

• The shutters are locked by the child. is in the present tense, while the original sentence is in the simple past tense.
• The shutters would be locked by the child. is in the conditional tense, which is used to describe an action that would happen under certain conditions. The condition in this sentence is not specified.
• The shutters had been locked by the child. 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 locking the shutters is not something that had happened before another action happened.