They sold their house for only 10,000 dollars, so the buyer got a good ________. [      ]

A. cost  

B. bargain  

C. amount  

D. value

有如下程序：

#include＜iostream＞

using namespace std;

class Test

{

public:

Test(){n+=2;}

～Test(){n-=3;}

static int getNum(){return n;}

private: static int n;

};

int Tesl::n=1 int main()

{

Test*p=new Test;

delete p;

cout＜＜"n="＜＜Tes::tgetNum()＜＜endl;

return 0;

}

执行后的输出结果是（）

A．n=0

B．n=1

C．n=2

D．n=3