C- civilizations
as people began to realize they could grow their own food instead of hunting or looking for food
Can your question be a bit more specific please? It could be anything from a certain species of plant or animal to a land region to agriculture and domesticated plants and animals.
With mid level education, supposing basic 4 year college you could get a stable job paying 100k or less. You would earn more than minimum wage and depends on the state you live in. With high level education you would make a great deal of money and you would be more valued to employers due to that