Hollywood's studio System Was Defined by the Fact That ________

Hollywood's studio system was defined by the fact that ________.

A) two major distribution companies handled 80% of the production studios' output
B) one major studio controlled production, one major studio controlled distribution and one major studio controlled exhibition
C) all foreign films had to be distributed in the U.S. via a tightly-structured theater system operated by MGM Studios
D) five major studios developed an efficient mode of production, distribution, and exhibition.