The best answer here is C, for or against a resolution. When you have a debate, it is split between two sides: a pro and con. Each side will argue their point, presenting facts to support it. The other answers don't make much sense considering the debate format since A and B refer to only one side of the argument and D only refers to what could come at the end. The purpose of the debate isn't to reach a resolution; the purpose is to present each sides of the argument so that people can make an informed decision.
