【单选题】

Which of the following best describes the main purpose of the passage
A．(A) To contrast the condition of African-American cinema with that of mainstream cinema

B．(B) To provide an economic explanation for the unpopularity of African-American cinema
C．(C) To criticize the assumptions mainstream audiences allegedly make toward African-American cinema
D．(D) To catalog the attitudes and practices responsible for the unpopularity of African-American cinema
E．(E) To outline the fundamental problem in African-American cinema and its most likely solution