单选题 Which of the following best describes the main purpose of the passage?

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