Answer:
In the conclusion of an argumentative essay, the author should restate the main ideas and summarize how they support the claim.
Explanation:
The conclusion of an essay is the last part that the readers will keep in mind and it has to make a clear emphasis on the side that the writer is expecting the reader to agree with, for this the main idea has to be re-stated and explain according to the arguments previously presented, both opposing and supporting points of view need to be addressed.