A passenger is not sure which class of service （economy， business， first） to choose. You should：

A passenger is not sure which class of service （economy， business， first） to choose. You should：
A.Decide for them.
B.Describe the differences in terms of amenities， price， and services for each class.
C.Tell them all classes are the same.
D.Recommend the most expensive one without explanation.
正确答案：B
试题解析：乘客对舱位等级不确定时，服务人员应详细介绍不同舱位在设施、价格和服务等方面的差异，帮助乘客做出选择。