Answer:
The correct answer is option B.
Explanation:
The opportunity cost of an economic decision can be defined as the cost of sacrificing or giving up the second-best alternative.
Sam has 3 hours to either attend a basketball game, a hockey match or the symphony.
If she going to the hockey match is her first choice and going to the symphony is the second choice. In this situation, the second-best alternative of the hockey match is going to the symphony.
So, the opportunity cost of attending the hockey match is going to the symphony.