They went to an outpost in Antarctica even though it has one of the harshest climates on the planet.
I’ve read this book, assuming the time period, it was the spark of industry so many jobs had terrible conditions, the pay was low, people were exhausted from they’re jobs, and poverty was bad, the answer is
A.) they found their jobs boring and unfulfilling
It is ineffective support because it presents opinion rather than fact. The author did not include the actual results of the study, but rather included a quote from a person.