On a relatively normal day, John ends up receiving an F on his midterm. Five years later, John can still clearly recall

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On a relatively normal day, John ends up receiving an F on his midterm. Five years later, John can still clearly recall this event. Which of the following principles best captures why John still recalls this event?
a The relative distinctiveness principle
b. The impurity principle
c) The specificity principle
d) The cue overload principle