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You have a 3 day weekend coming up. You can go to the beach with your family, spend the weekend at your best friend's house, or spend the weekend taking a SAT prep course. You would pick the weekend at your friend's house over the SAT prep course. What is your opportunity cost if you end up going with your family to the beach?

A) SAT prep course
B) weekend at your best friend's
C) time with your family
D) time at the beach