单选题 在下列横线处应添加的语句是( )。
class Base public:void fun() cout＜＜"Base::fun"＜＜end1; ;
class Derived:public Base

public:
void fun()

//显示调用基类的fun函数
cout＜＜"Derived::fun"＜＜end1;

;
A) Derived::fun B) Base::fun();
C) Pubic::fun D) fun();