Which of the Following Statements About Social Interaction Is True

Which of the following statements about social interaction is true?

A) All over the world it is natural for people to nod their heads to mean yes and shake them to mean no.
B) Silence may mean ʺyesʺ in talkative societies but ʺnoʺ in others.
C) Because they speak the same language, men and women can easily understand each other.
D) The person we interact with, just like anything else ʺout there,ʺ is absolutely real.