Topic: Interjection,

Best Answer Explained in Below-:

In the sentence "Emily has to clean her messy room before she goes out," the word "messy" serves as an adjective. Adjectives are words that describe or modify nouns, providing additional details about them. In this case, "messy" specifically describes the noun "room," indicating the state of the room in question.

Understanding the role of adjectives is crucial for interpreting the meaning of a sentence. By identifying that "messy" characterizes the type of room Emily is dealing with, we see that it highlights not just the action of cleaning but also the nature of the task at hand—cleaning a room that is in disarray.

On the other hand, verbs represent actions (like "clean"), nouns are names for people, places, or things (like "room"), and adverbs modify verbs, adjectives, or other adverbs. Since "messy" is not indicating an action, a name, or modifying another word but is instead giving descriptive detail about the state of a noun, it is clearly functioning as an adjective in this context. Therefore, the correct answer is A) Adjective.