I believe the answer would be D, based on the general themes of the poem and some specific lines, such as "Because you're handsome... is that a reason to be proud?" and "stoop from your cold height". Basically, the main character in the poem is a beautiful girl, who sees herself as superior to others because of her appearance.
Why did Homer Plessy believe that the Separate Car Act violated these rights? The Separate Car Act violated the 14th Amendment because different races were separated but not equal.