Which of the following is considered a type of conjunction?

A conjunction is a part of speech used to connect words, phrases, or clauses. The correct answer identifies a coordinating conjunction, which plays a crucial role in linking elements of equal importance within a sentence, such as "and," "but," or "or." Coordinating conjunctions allow for the construction of compound sentences and facilitate the flow of ideas by connecting similar grammatical structures.

The other options represent different parts of speech. Nouns are words that name people, places, things, or ideas. Adverbs modify verbs, adjectives, or other adverbs, usually indicating manner, place, time, or degree. Prepositions show relationships between nouns (or pronouns) and other words in a sentence, often indicating direction, location, or time. These parts of speech do not serve the same connective function that conjunctions do, specifically regarding the coordination of sentence elements.