Answer:
c)opportunity cost
Step-by-step explanation:
As Bobby is missing the job, it has to add up to the ticket cost the amount of labor wages lost during the concert and going bach and forth from his workplace.
That's because if Bobby didn't attend the concert it may have worked therefore, it will end with more han 60 dollars in his pocket.
The difinition for opportunity cost is the best alternative rejected. In this case is the wages against going to the musical