Suppose a student has 3 hours of time to spend at her apartment before afternoon classes. She has the option of doing laundry, studying for a test, or watching television. If she decides to do laundry, then her opportunity cost is__________

a. watching television and studying for the test.
b. studying for the test.
c. watching television.
d. either watching television or studying for the test, whichever would have been her second choice to doing laundry.