Melanie has just received an exam grade in her psychology class. she earned a grade of 89%, which is a b. all of her work during the semester thrust far has earned a grades, and she is very upset about the exam score. this is the worst thing that could possibly a have happened, she laments to her best friend, keisha, who just rolls her eyes. a cognitive psychologist would suggest that melanie is employing the cognitive disorder called

The correct answer is magnification. 

Magnification is a cognitive distortion or illogical and negative way of thinking that involves magnifying the negative aspects of a situation while undermining the positive aspects of a situation. Magnification means "making a mountain out of a molehill". In this instance, Melanie is magnifying the negative aspects of getting a B instead of an A by saying "its worst thing that could possibly a have happened" to her.