High Concentration in Most Individual Industries Is

High concentration in most individual industries is:

A) desirable because it better enables firms to coordinate their activities and policies to best serve the consuming public.
B) desirable because it leads to more intensive competition.
C) undesirable only because it is unfair to small businesspeople.
D) undesirable because it is thought to lead to less effective competition and to inefficient allocation of resources.
E) cannot be deemed desirable or undesirable on the grounds listed above.