Japanese society encourages masking emotions such as anger and sadness by exhibiting polite smiling or a neutral expression.What are these sorts of cultural norms called

A)  rules of engagement
B)  rules of conduct 
C)  display rules
D)  rules of polite society

Display Rules

Culturally determined guidelines that dictate how emotions should be expressed in social settings, affecting the intensity and type of emotional expression considered appropriate.

Cultural Norms

Common norms and guidelines that determine how individuals act within societal groups.

Anger

Intense irritation or anger, often leading to feelings of antagonism.