In a historical essay, how are body paragraphs related to the introduction paragraph?

A. The introduction paragraph describes the list of sources, and each body paragraph explains why that source is important.
B. The introduction paragraph presents the overall thesis, and each body paragraph provides evidence to support the thesis.
C. The introduction paragraph summarizes the evidence, and each body paragraph describes an opinion about that evidence.
D. The introduction paragraph makes a clear claim, and each body paragraph offers counterclaims in response.