Answer:
The correct answer is 3, A Coupon clip from a newspaper.
Step-by-step explanation:
Seeing from a consumer point of view, if he gets a free coupon from a newspaper, this is surely a positive incentive for him.
Sales tax imposed by the state, A steady rise in the profits over a year and increased price for a popular product are not positive incentives for the consumers. When consumer get something free, that is a real positive incentive for him.