C
C
B
B
A
C
C
B
D
A
Didn't ever read this so just looking at the question I went with what possibly could've made sense to the story<span />
The answer is C for this question.
The "great packing machine" refers to the slaughter industry the author describes through the book. He is trying to portrait and denounce the unhealthy, dangerous, almost-enslavement condition the workers suffer in that industry.
By going out a lot. Your friends introduce you to new friends who introduce you to new friends and so on
