Answer: Option A
Explanation: In simple words post decision resonance refers to the feeling of regret that one gets after making decision that the choice they made was not correct.
This theory suggests that the level of regret that one feels depends on two factors, the net desirability between the option chooses and option not chooses, the importance of the decision made in the Decision makers life.
In the given case, Kimberly bought a camera and now think she did not make right choice. Hence from the above we can conclude that the correct option is A.