已知类的继承关系如下：classEmployee;classManagerextendsEmployeer;classDirectorextendsEmp

已知类的继承关系如下：classEmployee;classManagerextendsEmployeer;classDirectorextendsEmployee;则以下哪个语句能通过编译？()

A、Employeee=newManager();

B、Directord=newManager();

C、Directord=newEmployee();

D、Managerm=newDirector();