The topic sentence of a body paragraph provides a thesis link by:

a. revising thesis to fit the body paragraph.
b. introducing the thesis of the essay.
c. mentioning the general subject of the essay.
d. providing an example that underscores the thesis.

C. Mentioning the general subject of the essay.

Explanation:

Topic sentence is the most important information in the paragraph. It is usually placed at the beginning of the paragraph and is developed through examples, allusions, and detail.  This implies that the paragraph contains a complete reasoning process, that is, a main idea and its necessary development. So every time we conclude one reasoning and want to start another, we start a new paragraph.

With this, we can conclude that the topic sentence of a body paragraph provides a thesis link for mentioning the general subject of the essay.

line a --> main

line b --> young

line c --> atitude