Which of the following statements is true about body language in different cultures?
A: In North America, looking directly at people during formal presentations is considered a sign of disrespect.
B: In Indonesia, people do not view squatting (蹲) as a normal body position.
C: In the United States, an up-and-down movement of the head means "yes" and a side-to-side movement of the head means "no."
D: In China, people generally offer a handshake that is firm and long lasting.