问题：
[单选题]用下面的SQL语句建立一个基本表，则可以插入到表中的元组是（ ）。CREATE TABLE Student(Sno CHAR (4) NOT NULL, Sname CHAR (8) NOT NULL,Sex CHAR (2),Age SMALLINT)
A、5021，′刘祥′，男，21
B、NULL，′刘祥′，NULL，21
C、′5021′，NULL，男，21
D、′5021′，′刘祥′，NULL，NULL
参考答案：
D
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