Which of the following sentences correctly uses an adverb?

The sentence that correctly uses an adverb is the one that describes how Tom ran, which is "Tom ran rapidly across the field." In this sentence, the word "rapidly" modifies the verb "ran," providing specific information about the manner in which he ran. Adverbs typically modify verbs, adjectives, or other adverbs, and in this case, "rapidly" accurately describes the action of running.

The other sentences either do not contain adverbs or do not use them correctly. For instance, "The tall man runs" contains the adjective "tall" to describe the noun "man," but it lacks an adverb. "Tom is a good player" features the adjective "good" instead of an adverb. Similarly, "She is the smartest student" utilizes the adjective "smartest" to describe "student" but does not include any adverb to modify a verb or an adjective.