单项选择题

有如下程序:
#include<iostream>
using namespaee std;
class Base
protected:
Base( )tout<<’A’;
Base(char C) cout<<c;

class Derived:public Base
public:
Derived(char C) eout<<c;

int lnaiD( )
Derived dl(’B’);
return 0;
执行这个程序屏幕上将显示输出

A.B
B.BA
C.AB
D.BB