If a Full- Time Student Decides to Spend a Day

If a full- time student decides to spend a day at the beach, the opportunity cost of this decision:

A) is best measured by the wage rate that the student could have earned had she/he decided to work full- time instead of studying
B) is equal to the cost of food and drinks purchased at the beach
C) equals the cost of the beach outing plus the value of the student's alternative use of the time, such as studying
D) is zero, since the student would have stayed in bed had she/he not decided to go to the beach