单选题 According to the author, African-Americans filmmakers have failed to take which of the following steps in properly promoting African-American cinema?

• (A) They have failed to demonstrate to studio executives the market potential of their films.
• (B) They have failed to express ideological issues in their films that could attract potential audiences.
• (C) They have neglected to use genuine African-American music as a force in their films.
• (D) They have exploited stereotypes about African-Americans for the gain of themselves, but not the genre.
• (E) They have failed to depict the African-American experience in an artistically engaging manner.