Why is it important to address opposing arguments when writing an argument?

A. It shows that your opinion on the topic is the best opinion.
B. It convinces people that you have done a lot of research on your topic.
C. It strengthens your claim because you have a chance to explain why it is invalid.
D. It shows why the opposing argument should not be considered by your readers.

C. It strengthens your claim because you have a chance to explain why it is invalid.