Which of the following about dining etiquette is true: ( )
选项：

A: In western countries, people sit casually when having dinner on formal occasions. It is acceptable to bend over, bow down, and eat with your mouth on the dishes.
B: In western countries, the buffet, which generally cannot be used in formal occasions, is relatively a free way of eating.
C: When banqueting guests, Chinese people consider the left as honor since ancient times, while the westerners consider the right as honor.
D: One of the characteristics of Western food is the abundance of tableware, including various sizes of cups, plates and silverwares. The number of knives and forks should match the preferences of the diners.