The author of Fast Food Nation claims that the fast-food industry prefers to employ teenagers. How does the author best support this claim?
a. by providing evidence that teenagers are the bulk of the workforce in America because many still live at home
b. by providing the counterclaim that teenagers typically leave behind their first jobs at fast-food chains for better opportunities
c. by providing evidence that teenagers are better at smiling and promoting the increased size of an order
d. by providing specific reasons why teenagers are ideal candidates, such as their acceptance of lower wages.