The Marketing Department of Cool-Down,Inc

The marketing department of Cool-down,Inc.,noticed that customers are not buying as many bottles of Cool-down soft drink in December as they usually do in July.Cool-down decided to offer coupons and refunds.It also planned a sweepstake.Which of the following elements of the promotional mix is Cool-down trying to use?

A) Personal selling
B) Direct marketing
C) Sales promotion
D) Public relations