His followers went around a lot into different regions
It's A because there are multiple enumerations separated by a comma and the coordinator 'and' which case you do not use comma when using it.
"That" is the relative pronoun because it refers to People, Animal, and Things, defining only.
Garrett Hardin argues for a very harsh thesis: we simply should not provide aid to people in poor countries. His argument is consequentialist: he claims that the net result of doing so would be negative -- would in fact be courting large-scale disaster. One of the things that we will notice about Hardin's essay, however, is that whether he is right or wrong, he paints with a very broad brush. This makes it a good essay for the honing of your philosophical skills; you should notice that there are many places where the reasoning procees with less than total care. Hardin begins with metaphors. He points out that while the metaphor of earth as a grand spaceship has a certain popularity (or did 23 years ago) .
