C because it sums up the whole passage
Explanation:
The Industrial Revolution forced the majority of the specialty tradesmen to retire from their respective profession because goods were being mass-produced in factories and these goods were also cheap.
Answer: Industrial Revolution
He was used to being made fun of.
We know this by him taking this reply in ‘with a sort of humble patience’. This means that he has experienced this kind of teasing - or even bullying before and he is used to it.
Well I would say that one of the central themes in Ernest Shackleton's South can be analyzing the complexity of the fight between the individuals and the society along with its "norms", in a world where nature is somewhat relentless towards humans. Hope this helped.