查询选修了课程号为'C2'的学生号和姓名，若用下列SQL的SELECT语句表达时，哪一个是错误的

A．SELECT S#，SNAME FROM S WHERE S#=(SELECT SS# FROM SC WHERE C#=‘C2’)
B．SELECT S#，SNAME FROM S，SCWHERE S#=SS#AND C#=‘C2’
C．SELECT S#，SNAME FROM S，SCWHERE S#=SS#AND C#=‘C2’ORDER BY S#
D．SELECT S#，SNAME FROM S WHERE S#IN (SELECT SS# FROM SC WHERE C#=‘C2’)