If an opinion contrary to your own makes you angry, that is a sign that you are subconsciously aware of having no good reason for thinking, as you do. If someone maintains that two and two are five, or that Iceland is on the Equator, you feel pity rather than anger, unless you know so little of arithmetic or geography that his opinion shakes your own contrary conviction.
If someone else's opinion makes us angry, it means that

Options

A. we are subconsciously aware of having no good reason for becoming angry
B. there may be good reasons for his opinion but we are not consciously aware of them
C. our own opinion is not based on good reason and we know this subconsciously
D. we are not consciously aware of any reason for our own opinion

Answer

C

Explanation

our own opinion is not based on good reason and we know this subconsciously