Which sentence is classified as imperative?

An imperative sentence is one that gives a command or request, often addressing the reader or listener directly. The sentence “Keep your flashlight with you at all times” gives a clear directive, instructing someone to take care of their flashlight. This type of sentence typically starts with a verb, which in this case is "keep," indicating what action the subject (implied as 'you') should take.

The other sentences serve different purposes; for instance, one expresses a personal preference, another describes an emotional reaction, and the last one asks a question. Each of these does not command or instruct, which is why they do not fit the classification of an imperative sentence.