Shontel's Family Is Hosting a Japanese Exchange Student,Yukiko,at Their Home

Shontel's family is hosting a Japanese exchange student,Yukiko,at their home for a year.Shontel notices that Yukiko hides her smile behind her hands.After reading Chapter 4 (Social Perception) ,Shontel learns that Yukiko hides her smile because

A) in Japan, smiles signal feelings of superiority.
B) Japanese norms discourage Japanese women from showing broad smiles.
C) she is extremely uncomfortable.
D) Japanese norms discourage men and women from smiling.
E) she wants to conform to American display rules.