小丽、小冬、小强三位同学去影剧院看电影，买了3 张挨着的电影票，他们共有(    ) 种不同的坐法。

— Do you have any idea why the bus-drivers are on strike?

— As far as I know, they are _____ a pay rise. [ ]

A. calling off

B. calling at

C. calling in

D. calling for