What do thinking and cognitive processes develop out of?

Which of the following would be most difficult for Francis Galton to explain with his theories?

A) Close family relatives often have similar traits. B) Sometimes children from very humble families become very successful. C) Successful parents often have successful children. D) In the United States, Whites are, on average, more successful than non-Whites.

Behavior therapists believe that both normal and abnormal behaviors develop

a. through a learning process. b. due to traumatic childhood events. c. because of environmental influences. d. due to poor genetic makeup. e. as a result of unconscious forces.