You are given a free ticket to see the nike mens basketball team play for the league championship. The Spurs are playing on the same night and is your next-best alternative activity. Tickets to see the spurs cost $40. on any given day you would be willing to pay up to $50 to see the Spurs Play. Assume there are no other costs of attending either Game. Based in this information, the opportunity cost of going to the nike mens basketball game is (CHOOSE the BEST ANSWER)
a) $0 b)$10 c) $40 d) 50