the conclusion of an argumentative essay must include a\ncounterclaim.\ncitation.\nquotation.\nsummary.

Answer

Brief Explanations:

The conclusion of an argumentative essay wraps - up the main points, so a summary is essential. A counter - claim is usually addressed in the body, a citation is for giving credit to sources throughout the essay, and a quotation is not a must in the conclusion.

Answer:

D. summary