Final answer:
William James, the first American psychologist, focused on the function of the mind and incorporated introspection into his research approach. Therefore, the correct answer is William James. Correct option is C.
Step-by-step explanation:
William James was the first American psychologist and a proponent of functionalism. While he incorporated introspection into his research approach, he also emphasized more objective measures and focused on how mental activities served as adaptive responses to an organism's environment. Therefore, the correct answer is
C) William James.