What is an example of a conjunction?

A conjunction is a part of speech that connects words, phrases, or clauses within sentences. The choice "and" is an example of a conjunction because it is used to link ideas together, such as connecting two nouns, verbs, or entire sentences. For instance, in the sentence, "I like apples and oranges," the word "and" connects the two nouns.

In contrast, the other options represent different parts of speech. "Quickly" is an adverb, describing how an action is performed. "Big" is an adjective, describing a noun's size. "Under" functions as a preposition, indicating a position relative to something else. These distinctions help clarify why "and" is the correct choice as it fulfills the specific role of a conjunction in English grammar.