Dear student
Seller A can sell the more products than seller B by adopting promotional techniques such as advertising, sales promotion, personal selling and also by decreasing the price of product. Through advertisement he can get the benefit of mass reach, through sales promotion he can stimulate the customer to buy the product such as by giving discounts, free samples etc, through personal selling he can get personal interaction and better response of the customers. All these leads to increase in sale.
Regards