Mark Quit His Job as a Salesman Where He Made

Multiple Choice

Mark quit his job as a salesman where he made $43,000 per year to start his own t-shirt making business.His business expenses are $6,000 per year on rent,$12,000 per year on supplies,and $4,000 per year on part-time help.As for his personal expenses,his apartment costs him $4,800 per year and his personal bills are an extra $1,200 per year.Which of the following is NOT part of the opportunity cost of running his business?

A) his apartment costs
B) his personal bills
C) his part-time labor costs
D) his apartment costs and his personal bills