Question

When the suffix -ly is added to an adjective such as discreet, the word

Answer 1

A. becomes an adverb as it becomes a word that describes a noun
i.e. "The mouse ran through the kitchen discreetly to get to the refrigerator."

Answer 2

When the suffix -ly is added to an adjective such as discreet, the word becomes an adverb. (Option A).

Adverbs are one of the four major word classes, along with nouns, verbs and adjectives Adverbs are a very broad collection of words that describe how, where, or when an action took place. They may also express the viewpoint of the speaker about the action, the intensity of an adjective or another adverb, among other functions. The -ly suffix is also an excellent way to describe how something, or how often, something is done.