In a Study Looking at Cultural Differences in Emotionality Following

In a study looking at cultural differences in emotionality following inoculation,

A) 90 seconds after the injection, three-fourths of the Japanese babies were no longer crying.
B) 90 seconds after the injection, virtually all of the North American babies were still crying.
C) European-American mothers spend more time in physical contact with their babies.
D) Asian babies once crying were much more difficult to sooth than European American babies.