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