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【单选题】
设关系数据库中有一个表S的关系模式为S(SN，CN，GRADE)，其中SN为学生名，CN为课程名，二者为字符型；GRADE为成绩，数值型，取值范围0～100。若要更正“”的化学成绩为85分，则可用（ ）。
A.
UPDATE S SET GRADE=85 WHERE SN='二' AND CN='化学'
B.
UPDATE S SET GRADE='85' WHERE SN='二' AND CN='化学'
C.
UPDATE GRADE=85 WHERE SN='二' AND CN='化学'
D.
UPDATE GRADE='85' WHERE SN='二' AND CN='化学'
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