Which pair of lines from the passage contains a change in intonation?

but all the time / i’se been a-climbin’ on,

and splinters, / and boards torn up,

it’s had tacks in it, / and splinters,

and places with no carpet on the floor— / bare.

well, son, i’ll tell you:
life for me ain’t been no crystal stair.
it’s had tacks in it,
and splinters,
and boards torn up,
and places with no carpet on the floor—
bare.
but all the time
i’se been a-climbin’ on,
and reachin’ landin’s,
and turnin’ corners,
and sometimes goin’ in the dark
where there ain’t been no light.
(from mother to son by langston hughes)

life is

when alex falls for the charming new boy at school, cole -- a handsome, funny, sports star who adores her - she can't believe she's finally found her soul who truly loves and understands her.  

at first, alex is blissfully happy. sure, cole seems a little jealous of her relationship with her close friend zack, but what guy would want his girlfriend spending all her time with another boy? as the months pass, though, alex can no longer ignore cole's small put-downs, pinches, or increasingly violent threats.  

as alex struggles to come to terms with the sweet boyfriend she fell in love with and the boyfriend whose "love" she no longer recognizes, she is forced to choose -- between her "true love" and herself.

explanation: