Not All Buyers of an Industry's Product Have Equal Degrees

Not all buyers of an industry's product have equal degrees of bargaining power with sellers because

A) sellers in an industry provide similar products and generally their cost structures are different because of competitive advantages in their operation.
B) some sellers may be less sensitive than others to price, quality, or service differences.
C) along the various stages of the value chain sellers are conducive to earning attractive profits.
D) the industry is a highly cohesive structure with limited fragmentation and few industry members.
E) sellers are large and few in number relative to the number of buyers.