"Brand Proliferation" in an Oligopolistic Industry

"Brand proliferation" in an oligopolistic industry

A) allows easier entry to a new entrant with small sales.
B) can shift the average total cost curve down and raise the overall minimum scale of operation.
C) allows new entrants to the industry to gain significant market share.
D) will generally reduce the expected market share of new entrants to the industry.
E) allows firms to cooperate to maximize their joint profits.