检索学生姓名及其所选修课程的课程号和成绩。正确的SELECT语句是______。

A．SELECT S.SN,SC.C#,SC.GRADE FROM S WHERE S.S#=SC.S#

B．SELECT S.SN,SC.C#,SC.GRADE FROM SC WHERE S.S#=SC.GRADE

C．SELECT S.SN, SC.C#,SC.GRADE FROM S,SC WHERE S.S#=SC.S#

D．SELECT S.SN,SC.C#,SC.GRADE FROM S,SC