A passenger bought a ticket with a promotional fare and wants to change it. What should you check？

A passenger bought a ticket with a promotional fare and wants to change it. What should you check？
A.If they are still in a good mood.
B.The terms and conditions of the promotional fare regarding changes.
C.The number of followers the passenger has on social media.
D.The color of their eyes.
正确答案：B
试题解析：促销票价通常有特定的使用规则，包括关于更改机票的规定。所以当乘客持促销票想要更改时，应首先查看促销票价的相关条款和条件。