Carelessly/ careless / carelessness
A: terribly: modifies old, an adjective
B: very smart: very modifies smart, an adjective
C; extremely modifies "slow", an adjective again
D: quickly modifies "hid" a verb - this is the correct answer!
Wot XD is this supposed to be a question
Either C or D I would say. Compared it to steel and plastic, but also related it to using slaves to get the sugar
the answer is A to this. I might have it confused with a different book.