Roz and Sara work as clerks in Trina's Trendee Clothes Shop. Trina withholds federal taxes from their pay, and controls the methods and details of the performance of their work. Roz and Sara are not authorized to modify the prices or other terms of a sale at the shop. At the shop, Roz and Sara are
a. independent contractors.
b. not Trina's agents or employees, or independent contractors.
c. Trina's agents and employees.
d. Trina's employees only.