One Reason the Psychology of Adaptation Found Such Fertile Ground

One reason the psychology of adaptation found such fertile ground and grew in the young United States was:

A) Americans valued theory over common sense and practical ideas.
B) Americans valued business, and useful knowledge.
C) Americans believed that innate traits defined people and these people would be more successful than others no matter the environment.
D) Americans had a long tradition of a feudal hierarchy, established churchs and ancient universities which all accepted the new theory of adaptation.