Which writing type is primarily about defining, discussing, or justifying topics?

The correct choice is expository writing, which is designed to explain, inform, or describe a topic in a clear and straightforward manner. This writing type focuses on providing factual information, developing ideas, and presenting arguments in a logical order. It often includes definitions, discussions, and justifications of topics, aiming to educate the reader without expressing personal opinions or emotions.

Expository writing is commonly found in textbooks, how-to articles, and instructional materials, where the goal is to convey information effectively. The clarity and objectivity in expository writing help the reader understand complex concepts or ideas thoroughly.

In contrast, persuasive writing aims to convince the reader of a particular viewpoint or argument, while narrative writing tells a story and involves character development and plot. Descriptive writing emphasizes sensory details to paint a vivid picture but does not prioritize defining or justifying topics.