检索选修课程"C2"的学生中成绩最高的学生的学号。正确的SELECT的语句是______。

A．SELECT S# FORM SC
WHERE C#="C2" AND GRADE> =(SELECT GRADE FORM SC)
WHERE C#="C2")
B．SELECT S#FORM SC
WHERE C#="C2" AND GRADE IN(SELECT CRADE FORM SC)
WHERE C#="C2"
C．SELECT S# FORM SC
WHERE C#="C2" AND GRADE NOT IN(SELECT GRADE FORM SC
WHERE C#="C2"
D．SELECT S# FORM SC
WHERE C#="C2" AND CRANDE> =ALL(SELECT GRADE FORM SC
WHERE C#="C2")