Answer:
Option (D) is correct.
Explanation:
Opportunity cost refers to the benefit that is foregone from the second best alternative.
Here, the total cost of skipping the practice includes both explicit cost and implicit cost.
Implicit cost is also known as the opportunity cost.
So,
Total cost = Explicit cost + Implicit cost
= Carnival admission fee + Money income would have been earned
= $9 + $15
= $24