Which form of discourse is primarily used to inform or explain a subject?

The correct choice, exposition, is a form of discourse specifically designed to inform or explain a topic to the audience. It aims to present information clearly and logically, often using definitions, examples, and explanations to enhance understanding. This form of writing is commonly used in textbooks, instructional materials, and articles where the primary goal is clarity in presenting factual information or analysis.

In contrast, persuasion seeks to convince the audience of a particular viewpoint or stance, utilizing emotional appeal and arguments. Narration focuses on telling a story or recounting events, emphasizing plot and character development. Description aims to create a vivid picture through detailed sensory language, appealing to the reader’s senses. While these other forms of discourse serve valuable purposes, they do not primarily focus on explaining or informing in the straightforward manner that exposition does.