personal opinions are enough to support a claim.
most causes are unpopular with readers.
O all readers must agree with the essay's topic.
A. People may disagree with the essay's opinion.
I could be wrong, but when you are to write an argumentative essay, you need to realize that many people won't agree with what you write about. For instance, if you were to write about whether or not chocolate is better than vanilla. People can disagree to that situation.
A. people may disagree with the essay’s opinion.