Why is it necessary to respond to (a) counter-argument(s) in a critical essay?

Why is it necessary to respond to (a) counter-argument(s) in a critical essay?
A、To add a new position to your essay.
B、To criticize the opposing point of view.
C、To make your own argument more convincing.
D、To produce a longer essay.
正确答案：To make your own argument more convincing.