What is a defining feature of an imperative sentence?

An imperative sentence is characterized by its function of giving commands, requests, or instructions. This type of sentence directs someone to perform an action, often using the base form of the verb. For example, "Close the door" is an imperative sentence specifying what the listener should do. The commanding nature of the sentence, whether it's polite or forceful, is what sets it apart from other sentence types.

Options that state a fact, express questions, or suggest emotional intensity with exclamation marks do not fulfill the core function of an imperative sentence. Therefore, the defining feature focuses specifically on the act of issuing a command, making the choice that emphasizes this aspect entirely accurate.