为自己加油

现有员工表
A，包含员工(staff _id) 和部门 id(section id)两字段， 部门
B，包含部门 id(section id) 和部门所在城市(city)两字段，若想要查询该公司每个城市的员工数，以下语句可以实现的是?

A.select city,count(staff_ id) from A join в on A .section_ id= B section_ id group by section id;
B.select city,count(staff id) from A join в on A .section id=B .section_ id group by city;
C.select city,count(staff_ id) from A join в where A section_ id =B .section_ id group by section id;
D.se1ect city,count(staff_ id) from
A,B group by city;