your claim can be supported best when you present\nthe three main parts of an argumentative essay are the…

Brief Explanations:

An argumentative essay has three main parts. The introduction presents the topic and claim. The body paragraphs provide evidence and reasoning. The conclusion summarizes the main points and reinforces the claim. Among the options, "conclusion" is the standard third part of an argumentative essay. "Assertion" is a statement within the body, and "counterclaim" (a claim opposing the main claim) is usually addressed in the body paragraphs.

Answer:

conclusion