Question

Why is it important to know an opponent's position when developing an argument?

Answer 1

Answer:

So readers know what you are trying to disprove.

Explanation:

When you need to develop an argument you should know your opponent's position on the subject you are going to discuss.

Knowing the position of your opponent you can set up your argument in a competitive and coherent way. This will lend credibility to your argument and will make it clear to readers what you are trying to refute.

Answer 2

I would say your answer is C. So readers know what you are trying to disprove.
Hope this helps!
~♥Nikki♥~