Question

in the body of the essay, the writer should present
a clear thesis
biographical data
supporting evidence
opinions of others

Explanation:

In an essay, the body is where the writer provides details to support the thesis (which is usually in the introduction). A clear thesis is presented in the introduction, not the body. Biographical data is only relevant if the essay is about a person's life, and opinions of others are not the main focus of the essay body (which should be the writer's own development with evidence). The body should present supporting evidence for the thesis.

Answer:

C. supporting evidence