Twain
I think it is 4 (The yellow one). His response is certainly exaggerated. He is worshiping body and soul -- a piece or pieces of paper. Amazing! He's likely trembling at the sight of it. After all, who has seen a 1 million pound note? Each pound worth $5? Twain is rich before avarice!!! He has more money than Midas could manufacture. It's four
Whitman
He is singing of everyman. Each has a different song, each sings their own view of what their lives mean. The young girl is quite different from the men. The men are quite different from the older women, but all of them have a song. None of the choices are eliminated. All of them say the same thing about the nature of their lives. Maybe you could eliminate A. It is not so much equality as differences.
Hughes
Hughes would never say that there is equality in America. He starts out in the kitchen. Eventually he is at the main table. (Because he has grown strong). A is incorrect.
It's not B. Eventually he get's out of the kitchen. When he does, he's strong.
It's not C. The point is that he get's out of the kitchen.
This is a real dilemma. All of Whitman's could be defended as right; all of Hughes' choices are indefensible. I suppose that the best answer is the second one. But it is only 1/2 the story, because eventually he makes it to the household dining room. You could pick B. But B is only 1/2 the answer.