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Amy can study for an hour or spend that hour sleeping or going out for dinner. If she decides to study for the hour, the opportunity cost of the hour spent studying is:_______
a. sleeping or going out for dinner, whichever she would have preferred the most
b. definitely going to sleep.
c. sleeping and going out for dinner.
d. studying since this is the choice she opted for.
e. definitely going out to dinner because she must eat at some time