Which type of verb gives a clear demonstration of action?

The correct choice is action verb because these verbs specifically indicate an action being performed. They express dynamic movement or activity that can be observed or visualized, such as "run," "jump," "write," or "play." This clear indication of what the subject is doing provides a straightforward understanding of the action taking place in a sentence.

The other types of verbs in the question serve different purposes. Descriptive verbs are not a standard category on their own; instead, they might refer to adjectives or adverbs that provide further details about the action or state but do not clearly demonstrate action themselves. Linking verbs, such as "is," "are," and "seem," do not show action but rather connect the subject to a subject complement, providing states of being or identities rather than actions. Transitive verbs, while they do indicate action, specifically require a direct object to complete their meaning. An action verb, on the other hand, clearly conveys action on its own without needing a direct object, making it the most direct representation of action.