Answer:
Option (D) is correct.
Step-by-step explanation:
Given that,
Money income earned as a swimming assistant coach at university = $15 per hour
Admission fee for the county fair = $9
Here, the opportunity cost of skipping the practice is the loss of money income from the coaching.
Therefore,
Total cost of skipping practice:
= Money income lost for one hour + Admission fee for the county fair
= $15 + $9
= $24