the conclusion of an argumentative essay must include a\no counterclaim.\no citation.\no quotation.\no…

Brief Explanations:

The conclusion of an argumentative essay wraps - up the main points. A summary restates the key arguments and positions, which is essential. A counter - claim is usually addressed earlier in the essay, a citation is for giving credit to sources throughout, and a quotation is not a requirement for the conclusion.

Answer:

D. summary