In which situation would a T Chart be the most effective form of brainstorming?

In which situation would a T Chart be the most effective form of brainstorming?
A.when creating formulating an argument
B.when showing the cause and effect of a situation
C.when comparing two things
D.both answers a and c
E.Do not judge your ideas at the beginning.Simply just get your ideas out.
正确答案：D