When Mary Lynn went to the grocery store last week, she took with her several coupons she had received in the mail that week. While at the store, Mary Lynn was offered samples of several food items and she actually bought a few of those, using the in-store coupons. She also bought a particular brand of toothpaste, because the tube came with a free toothbrush. Mary Lynn is taking advantage of:
a) sales promotion.
b) advertising.
c) publicity.
d) viral marketing.

Sales promotion

Explanation:

To benefit from sales promotion, the customer would buy in access to his needs and also chooses the brands which he has never bought or is reluctant to buy. All this behavioural change is because of sales promotion which offers heavy discounts that encourages increase purchases. In this scenario Mary Lynn is taking benefit of sales promotion by buying in excess and buying those products that are in promotion list.

answer about 4-5 percent of the labor force is unemployed;