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 ___
题型：单项选择题
问题：
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# FROM SCWHERE C#="C2" AND GRADE＞ =(SELECT GRADE FROM SCWHERE C#="C2")
B．SELECT S# FROM SCWHERE C#="C2" AND GRADE IN(SELECT GRADE FROM SCWHERE C#="C2")
C．SELECT S# FROM SCWHERE C#="C2" AND GRADE NOT IN(SELECT GRADE FROM SCWHERE C#="C2")
D．SELECT S# FROM SCWHERE C#="C2" AND GRADE＞ =ALL(SELECT GRADE FROM SCWHERE C#="C2")