Which part of speech modifies verbs, adjectives, and other adverbs?

In grammar, different parts of speech serve distinct functions. An adverb is a word that modifies a verb, an adjective, or another adverb, providing more information about how, when, where, or to what extent an action or quality occurs.

• “Adverb” is the correct answer because its primary role is to modify verbs (e.g., runs quickly), adjectives (e.g., very happy), and other adverbs (e.g., quite slowly).
• “Conjunction” is incorrect; conjunctions join words, phrases, or clauses.
• “Noun” is incorrect; nouns name people, places, things, or ideas.
• “Interjection” is incorrect; interjections express sudden emotion or surprise.