Red bull sends out student brand managers to distribute free samples to their peers. What form of marketing communication is this?

B. Sales promotion

Explanation:

Sales promotion involves letting a target market know about your product with the aim of persuading them to purchase the products. It is a short term marketing strategy used to increase the demand of the product or service in question. It is usually used to introduce new products to the markets. In this case Red bull uses the sales promotion strategy by giving their student brand managers free sample to distribute to their peers.