单选题 It may be inferred from the passage that at the time Invisible Man was published, many blacks contributed more to American life than Ellison by

• (A) establishing and arguing for the implementation of social practices more affirmative than those found in Invisible Man
• (B) eschewing the obligations that praise of Ellison's work entailed for him, and thereby working to subvert the literary system
• (C) supporting a vision of "exceptional" America in contrast to Ellison's "unexceptional" version, and broadening the scope of that vision
• (D) putting the same theories of reform Ellison espoused in his book into concrete practice through activism
• (E) exposing the more effective critique of traditional American values advanced by Ellison's literary precursors