According to Professor Hammer, which of the following characteristics did Langston Hughes share with modernist poets like William Carlos Williams, Marianne Moore, Hart Crane, and Robert Frost ?

• A. Hughes was very conscious that he was an American poet, and this profoundly influenced his writing.
• B. Hughes wrote about the legacy of the American Civil War and its long-term cultural consequences.
• C. Hughes introduced new subject-matter and new language into poetry.
• D. Both A and C