What type of verb indicates an action performed by the subject of the sentence?

The correct choice highlights the concept of active voice in sentence structure. An active verb is one that expresses the action of the subject directly, making the sentence clear and dynamic. For example, in the sentence "The dog barks," "barks" is the active verb that shows what the dog is doing. This direct relationship between the subject and the action is crucial for conveying meaning effectively.

Other options, such as adverb, adjective, and noun, serve different grammatical functions. An adverb modifies a verb, an adjective describes a noun, and a noun serves as the subject or object within a sentence. Therefore, none of these options indicate action directly performed by the subject like an active verb does. Understanding this distinction is fundamental to mastering sentence structure and enhancing overall writing clarity.