1. Understanding opportunity costYou work as an assistant coach on the university swim team and earn $15 per hour. One day, you decide to skip the hour-long practice and go to the county fair instead, which has an admission fee of $9.The total cost (valued in dollars) of skipping practice and going to the fair (including the opportunity cost of time) is .

(A) $6
(B) $9
(C) $15
(D) $24