Answer:
The correct answer is C
Step-by-step explanation:
A brand named Maybelline released an ad for the product of age minimizing makeup and offering the readers the $1 off coupon, so in terms of the communication, the source is the term which is described as the person or the reader who use the service or the product.
Therefore, the source of the ad is the readers who redeem the coupon featuring off $1 on the product.