An ad for Maybelline age-minimizing makeup in Ladies' Home Journal magazine featured international film star Ziyi Zhang and offered readers a $1-off coupon to try the new makeup

In terms of the SMCR communication model, which of the following would be the best way for the source to measure feedback?
A) the number of subscribers to Ladies' Home Journal
B) the number of people who make up the target market
C) the number of people who redeem the coupon
D) the number of people who were exposed to the ad
E) the number of people to whom Ziyi Zhang is an appealing spokesperson

C