When we organize our persuasive speech in the comparative advantages order, we know our audience _____.
选项：

A:is already aware of the existence of a problem but not sure which to choose among many solutions;
B:is already aware of the solution to a problem but not sure why we should choose that solution;
C:has no idea about the existence of a problem, let alone the solution to it;
D:has no idea about the solution to the problem, let alone the cause of it