【单选题】Suppose after graduating from college you get a job working at a bank earning $30,000 per year. After two years of working at the bank earning the same salary, you have an opportunity to enroll in a ...
A.
The cost of tuition and books to attend the graduate program.
B.
The $30,000 salary that you could have earned if you retained your job at the bank.
C.
The $45,000 salary that you will be able to earn after having completed your graduate program.
D.
The value of insurance coverage and other employee benefits you would have received if you retained your job at the bank.