检索“至少选修课程号为'C1'的学生姓名(SNAME)”的SQL语句是

A．SELECT s.sname FROM s, sc WHEREC.cno＝'C1'

B．SELECT s.sname FROM s, sc WHERE C.cno='C1'AND s.sno＝sC.sno

C．SELECT s.sname FROM s, sc WHERE

D．cno='C1'AND s.sno＝s