單項選擇題要查詢st_info表中姓"王"且單名的學生情況，可用（）命令。

A.SELECT * FROM st_info WHERE st_name LIKE ´王%´
B.SELECT * FROM st_info WHERE st_name LIKE ´王_´
C.SELECT * FROM st_info WHERE st_name=´王%´
D.SELECT * FROM st_info WHERE st_name=´王__´