Why is it important to know an opponent's position when developing an argument?
so readers can disagree with the point you are arguing.
so readers can decide for themselves which side is more entertaining.
so readers know what you are trying to disprove.
so readers understand who is arguing that point.

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.

many battles and wars (such as the one at gettysburg), are commemorated by statues or monuments, with some areas preserved as monuments and national parks. do you think this contradicts the message of "grass"? in at least 200 words, explain your thinking and cite evidence from the poem to support your opinion.