During the summer you have made the decision to attend summer school. Attending summer school prevents you from working at your usual summer job in which you normally earn $5,000 for the summer. Your tuition cost is $4,000 and books and supplies cost $1,200. The opportunity cost of attending summer school is:

Select one:

a. $6,200.

b. $5,200.

c. $9,000.

d. $10,200.