When Comparing the Crying Behaviors of South Korean Infants to the Crying

When comparing the crying behaviors of South Korean infants to the crying behaviors of American infants,it is clear that:

A) the behaviors of the mother influenced the average length of time an infant cries.
B) temperament varies between cultures and affects the length of time an infant cries.
C) there are no differences between cultures in length of time that an infant cries.
D) the attitudes of the father influence their infant's length of crying.