What distinguishes a thesis statement from a topic sentence?

What distinguishes a thesis statement from a topic sentence?
A、A thesis statement states the main point of the entire essay, while a topic sentence focuses on a single paragraph.
B、A thesis statement is only found in the introduction, while a topic sentence can be placed anywhere in the essay.
C、A thesis statement expresses an opinion on a topic, while a topic sentence introduces a new subject.
D、A thesis statement is longer and more detailed than a topic sentence.
【正确答案】：C