Question

in the conclusion of an argumentative essay, the author should
include a \hook\ to capture the readers attention.
add details, facts, examples, and statistics.
restate main ideas and summarize how they support the claim.
present counter arguments and explain how they are flawed

Explanation:

In an argumentative essay conclusion, the main goal is to restate main ideas and show how they support the claim. A hook is for the introduction. Details, facts etc. are for the body. Counter - arguments are usually addressed in the body too.

Answer:

restate main ideas and summarize how they support the claim