The best example of alliteration from the given lines of poetry is:
D: "bob climbed each rung of the corporate ladder while those around her grew anxious in madder."
Alliteration is the repetition of the same consonant sound at the beginning of closely connected words, and in this line, the "c" sound in "climbed" and "corporate," and the "m" sound in "madder" create a rhythmic quality associated with alliteration.
While there are elements of repetition in the other lines, they do not exemplify alliteration as clearly as D.