What does the author intend to say by the example in the second paragraph?
A.Some customers simply show no respect to those who serve them.
B.People absorbed in a phone conversation tend to be absent-minded.
C.Waitresses are often treated by customers as casual acquaintances.
D.Some customers like to make loud complaints for no reason at all.
请帮忙给出正确答案和分析,谢谢!