Emotion Recognition Experiments Show That People from Different Countries or Cultures

Emotion recognition experiments show that people from different countries or cultures are not 100% accurate in recognizing a facial expression of emotion. This lack of 100% accuracy is because

A) facial expression of emotion are not expressed in some countries or cultures; people show blank faces.
B) facial expressions of emotion are influenced by dialect, which differs by country or culture.
C) facial expressions differ greatly among countries to the same extent that languages differ,e.g., Chinese vs English.
D) people are simply unable to interpret or lack the skill to interpret facial expressions of emotion.