At a national auto show, Honda hosted a booth and brought several models of its vehicles for customers to sit in to get a close-up view various models. Customers were then encouraged to fill out a comment card letting Honda know what their favorite model was. At the fair, one comment card would be chosen by the company and that person would win the car of their choice. This is an example of
a. a coupon.
b. a deal.
c. a sweepstakes.
d. a contest.
e. a premium.