单项选择题

有如下程序:
#include<iostream>
using namespace std;
class Base
private:
char c;
piblic:
Base(char n):c(n)
~Base()
cout<<C;

class DeriVed:public Base
private:
char c;
public:
Derived(char n):Base(n+1),c(n)
~Derived()
cout<<c;

int main()
Derived obj(’x’);
return 0;
执行上面的程序将输出

A.xy
B.yx
C.x
D.y