An Unemployed Individual Decides to Spend the Day Fishing

An unemployed individual decides to spend the day fishing. The opportunity cost of fishing is

A) the cost of bait and any other monetary expenses.
B) zero, because the person doesn't have a job.
C) the cost of bait, any other monetary expenses, and the value of the individual's wages while he was working.
D) the cost of bait, any other monetary expenses, and the value of the best alternative use of the individual's time.