The topic sentence of a body paragraph:

A. introduces the thesis statement.

B. outlines one thesis point.

C. is developed during the proofreading step.

D. summarizes the essay’s main points.

D

Wrong.

To determine the correct answer to this question, we can break it down and analyze each option.

A. Introduces the thesis statement: The thesis statement is usually found in the introductory paragraph of an essay, not within a body paragraph. Therefore, option A is incorrect.

B. Outlines one thesis point: This option is a potential answer because a body paragraph typically focuses on supporting or explaining one main point or idea related to the thesis statement. However, we should consider the other options before confirming this as the correct answer.

C. Is developed during the proofreading step: The proofreading step refers to reviewing and correcting errors or mistakes in a written work. It does not relate to the content or structure of an essay. Thus, option C is not the correct answer.

D. Summarizes the essay’s main points: This option is the most accurate answer. The function of a topic sentence within a body paragraph is to introduce the main point of that particular paragraph, and it often serves as a mini-summary of what the paragraph will discuss. Therefore, option D is the correct answer.

In conclusion, the topic sentence of a body paragraph summarizes the essay's main points.