The correct answer is: B. Let not the police be informed about the robbery.
The sentence “Do not inform the police about the robbery” is a negative command. In English, negative commands are typically formed by using the negative auxiliary verb “do not” or “don’t” with the base form of the verb. In this case, the verb is “inform.”
The sentence “Let not the police be informed about the robbery” is a negative imperative sentence. Imperative sentences are used to give commands or make requests. In English, negative imperative sentences are typically formed by using the negative auxiliary verb “let not” or “don’t let” with the base form of the verb. In this case, the verb is “be informed.”
The sentence “The police do not be informed about the robbery” is grammatically incorrect. The verb “be informed” is in the passive voice, but the sentence is not in the passive voice. The passive voice is used to focus on the action, not the agent of the action. In this case, the agent of the action is the police, so the sentence should be in the active voice.
The sentence “Let the police be informed about the robbery” is grammatically correct, but it is not a negative command. A negative command is a command that tells someone not to do something. In this case, the sentence is telling someone to do something.
The sentence “The police need to be informed by the robbery” is grammatically correct, but it is not a negative command. A negative command is a command that tells someone not to do something. In this case, the sentence is telling someone to do something.