C: are aware of our attitudes and focus attention on any discrepancies among them

    Incorrect.
Self-perception theory states that because we have no special access to our attitudes, we infer them from our behavior.  Choice C states that we do have access to our attitudes (i.e. "we are aware of our attitudes), so it is wrong.  Choice C would fit much more closely with the theory of cognitive dissonance, which states that there is a state of uncomfortable tension that exists when two attitudes are psychologically inconsistent.