In the Famous Du Pont Cellophane Case,the Supreme Court Ruled

In the famous Du Pont cellophane case,the Supreme Court ruled that even though Du Pont had a 75 percent market share in cellophane,it did not have monopoly power in cellophane,because:

A) other functionally equivalent products were available in the market.
B) Du Pont had not acquired its market power through improper means.
C) cellophane was not a significant product in interstate commerce.
D) inference of monopoly power requires market share in excess of 80 percent.