An author of argumentative essays writes for which purpose?

A. To encourage
B. To excite
C. To persuade
D. To infer

C. To persuade

The purpose of an author of argumentative essays is usually to persuade the reader.

The correct answer is C. To persuade.

To determine the purpose of an author of argumentative essays, we can look at the characteristics and goals of argumentative writing. Argumentative essays aim to convince the reader of a specific viewpoint or idea by presenting logical reasoning, evidence, and persuasive language. The purpose of these essays is not just to entertain or excite the reader, but rather to persuade them to agree with the writer's perspective. The author's main objective is to convince the reader by presenting a compelling argument and supporting it with solid evidence. Hence, the correct answer is C. To persuade.