I believe that the answer is A, to emphasize a point.
I think it's a because every word has a subject and a verb
The correct answer for the question that is being presented above is this one: "b. Mary had heard herself mentioned to Miss Bingley as the most accomplished girl in the neighbourhood; and Catherine and Lydia had been fortunate enough never to be without partners, which was all that they had yet learnt to care for at a ball"
The rhyme scheme of the poem The Eagle is A-A-A-B-B-B.
Hands-Lands-Stands=A
Crawls-Walls-Falls=B
She making mention to the African american males of that time period who went to bars and played pool and jazz music and drank alchohol instead of finishing school