The answer is "D" my dude. Hope this help :D
in that paragraph, the expression Mounting evidence could be a bit confusing, but it indicates that there's been reaserch about it before, and that it all points in the same direction, the more research proving the same point means the data is convincing. The answer is D.
A society is II.
Think about this. Although there are many different ethnic groups in New York, all of them have one thing in common: their lifestyles. They share the same institutions as well.