Research on Cultural Differences in Temperament Shows That

Research on cultural differences in temperament shows that:

A) although 48 percent of the children in the U.S. show a genetic pattern associated with impulse problems, the genetic pattern occurs in only 2 percent of Chinese children
B) Chinese babies are on average calmer and easier to console than Caucasian babies
C) Chinese preschoolers are on average better than Caucasian babies at controlling their impulses
D) all of the above