Which of these is a problem with display rules that dictate which emotions are appropriate in particular situations?

a. there is no societal agreement on these rules.
b. the facial expressions used to display basic emotions such as anger or disgust differ from culture to culture.
c. verbal messages are so much more powerful than nonverbal sources of information, especially when verbal and nonverbal messages are incongruent.
d. microexpressions often give away momentary lapses in the control of our expressions