When a student chooses to take an exam instead of skipping it for a hunting trip, what is the student's opportunity cost of taking the exam?

A$.$ the student's increased chance of graduating in four years

B$.$ a better grade in a class the student almost took instead

C$.$ the difference between a perfect score and the student's actual performance

D$.$ the hunting trip the student will miss

E$.$ one class session's worth of the student's tuition money