Final answer:
Xuxez uses product placement by having Riverdale characters wear their sportswear to reach teenagers, a demographic that avoids traditional ads.
Step-by-step explanation:
The type of promotional activity used by Xuxez, a sports apparel retailer, is based on product placement. Unlike traditional advertisements, product placement involves incorporating a brand or its products into the content of an entertainment medium. In the case of Xuxez, the company has chosen to have characters in the popular teen series Riverdale wear its newest sportswear line during episodes. This approach aims to familiarize the audience with the brand in a setting that does not feel like conventional advertising, thereby reaching the target demographic, teenagers, who tend to avoid traditional ads.