In Cognitive Dissonance Theory, the Term "Insufficient Justification" Refers to the Idea

In cognitive dissonance theory, the term "insufficient justification" refers to the idea that

A) the less appealing the reward for something, the less likely we are to do it.
B) we are more likely to blame ourselves for our bad behavior if we believe it was unjustified.
C) we are more likely to experience a state of unpleasantness when we do not have an external reason for an inconsistency between our attitudes and our behavior.
D) we are more likely to judge other people negatively if we believe that their behavior was unjustified.