Nomads became Villagers because they figured out Farming and didn't have to go from place to place hunting. So the villages had farms which led to (surplus) (extra food) and surplus led to growing populations and that led to civilizations.
The correct answer is C. Harsh weather .
The Trail of Tears was a journey of over a thousand miles for the Cherokee people. This journey resulted in the Cherokee moving from their ancestral homeland of Georgia to modern day Oklahoma. This journey took a significant amount of time and resulted in many deaths due to the brutal cold faced by the Cherokee when marching to Oklahoma. Along with this, the lack of adequate clothing and shelter along this journey ensured that the tough weather conditions would have a significant impact on these people.
People, who were classified as a new middle-class were people that started to make their own careers (starting business of getting a well-paid job), they have observed a great growth in their salaries at that time and had a lot of leisure time.
Expertise had a very important role - people believed that it is a solution to the weakness of society.