When David Reads About the Differences in the Behavioral Tendencies

When David reads about the differences in the behavioral tendencies between the people of cultures on two different continents, he speculates about what possibly could have caused the two groups to differ so much. Researchers could inform him that __________.

A) individuals with a particular personality trait may have been more willing to travel together to a new location
B) the way that a group sustains itself may shape personality styles
C) people may move to a new location based on their perception that the traits they possess and value are more common there
D) all of the above