[单选题]Yank，the protagonist of Eugene O'Neill's play The Hairy Ape, talked to the gorilla and set it free because（ ）. A he was mad，mistaking a beast for a human B he was told by the white young lady that he was like a beast and he wanted to see how closely he resembled the gorilla C he was caged with the gorilla after he insulted an aristocratic stroller D he could feel the kinship only with the beast