Which of the Following Is NOT a Factor That Causes

Which of the following is NOT a factor that causes buyer bargaining power to be stronger?

A) Some buyers are a threat to integrate backward into the business of sellers and become an important competitor.
B) Buyers are small and numerous relative to sellers.
C) Buyers have considerable discretion over whether and when they purchase the product.
D) Buyers purchase the item frequently and are well-informed about sellers' products, prices, and costs.
E) The costs incurred by buyers in switching to competing brands or to substitute products are relatively low.