According to this passage, how is the word center spelled in British English

A．A smooth surface.
B．An actor.
C．An apartment.
D．A movie.

A．British English and American English are the same.
B．They are so different that Americans can' t understand Englishmen when they are talking.
C．They have different spelling and vocabulary but the same pronunciation.
D．They have slight different spelling vocabulary and pronunciation, but the people can understand each other.