You are more upset by missing an a by 2 points than by 10 points, because you imagine yourself earning a better grade than the one you actually earned. this is an example of
a) implicit thinking.
b) explicit thinking.
c) counterfactual thinking.
d) the fundamental attribution error.

The correct option is: C) Counterfactual thinking

Explanation:

Counterfactual thinking refers to the human tendency of creating possible alternatives to the events that have already occurred. Counterfactual thoughts arises when an individual modifies a factual prior the event and assesses the various consequences of the change.  

Counterfactual thoughts can produce negative emotions like guilt, regret and positive emotions like relief, satisfaction.

Therefore, the given situation is an example of Counterfactual thinking.