Which of the following might illustrate the law of specialization?
a. Simone runs a dry cleaning business and notices that when she hired a fifth worker, the number of suits cleaned stayed the same.
b. All of the above.
c. Cherise has a cleaning business and notices that when she hired a fourth worker, the average number of houses cleaned decreased by 25 percent.
d. Skylar has a donut shop and notices that when she hired a third worker, her output grew by 75 percent.