He claim of an argument is the overall "theory" you are asserting.

True

When you're stating a claim in an argument, whether it's an essay or a speech, you want to make sure that it's clear and concise. This 'theory' is what you are going to spend your piece proving, so it should be strong and carefully thought out. 

Pardon me. to answer questions like this, we would have needed more information. for starters, two sentences from the excerpt that came with the question.