Suppose you are earning $12 an hour at the local grocery store. At that wage you have decided to work 20 hours a week. If your wage were to increase to $19 an hour, thinking like an economist using the economic decision rule, you would most likely choose to work:
A. more hours because the opportunity cost of leisure has risen.
B. fewer hours because the opportunity cost of leisure has fallen.
C. fewer hours because the opportunity cost of work has fallen.
D. more hours because the opportunity cost of work has risen.