College Composition CLEP Prep Practice Test - Complete Study Guide

The main purpose of the conclusion in an essay is to summarize the content of the essay and provide closure for the reader. Option A is incorrect because the development of the main idea is usually covered in the body paragraphs of the essay. Option B is incorrect because the introduction is meant to introduce the topic and provide background information, not the conclusion. Option D is incorrect because questioning the topic would be more appropriate in the introduction or in the body paragraphs. Therefore, the most accurate and appropriate answer is option C.