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