Question

What is the most likely reason the author uses dialect in these lines of dialogue?
"Dey's two gals flyin' 'bout you in yo' life. One uv 'em's light en t'other one is dark. One is rich en t'other is po'. You's gwyne to marry de po' one fust en de rich one by en by.You wants to keep 'way fum de water as much as you kin, en don't run no resk, 'kase it's down in de bills dat you's gwyne to git hung."
(from Adventures of Huckleberry Finn by Mark Twain)

Answer 1

to hint that the character is from a big city
to draw attention to the character's poverty
to refer to the character's religious upbringing
to show the character's lack of sophistication