Answer:
Sports Merchandise
Explanation:
According to the situation that has been described in the question it can be said that the loss is suffered by Sports Merchandise. This is because a the seller of a good or product is liable for that product until the buyer purchases the product and decides to keep it. Which in this scenario since Sports Merchandise made a mistake on the product size and Quest decided not to accept the product then the responsibility and risk of loss remained with Sports Merchandise as the owner of the product.