In a subject-by-subject comparative essay, each body paragraph must
a. present a separate viewpoint of the topic.
b. support the thesis statement.
c. rely on few supportive details.
d. depend on opinion rather than fact.

B. support the thesis statement.

In a comparative essay, each body paragraph must support the thesis statement. The thesis statement is the main idea of a text. It usually consists of a single sentence which summarizes the claim that the author attempts to prove in his essay. Therefore, all paragraphs in an essay must support the thesis statement. This is the only way to ensure that all ideas are properly linked and that no superfluous or unnecessary information is included.

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nature is sure to be the best thing on earth

the sunshine and beauty is sure to be worth

this can't be sold

for any money or gold

because nature is strongly beautiful and is the best thing to happen on earth