若有以下程序：
#include ＜iostream＞
using namespace std;
class A

private:
int a;
public:

A(int i)a=i;void disp()cout＜＜a＜＜",";;
class Bprivate:
int b;
public:
B(int j)b=j;void disp()cout＜＜b＜＜",";;
class C:public B,public Aprivate:
int c;
public:
C(int k):A(k-2),B(k+2)c=k;void disp()cout＜＜c＜＜endl;;
int main()

C obj(10);
obj.disp();
return 0;程序执行后的输出结果是(
)。A．10,10,10
B．10,12,14
C．8,10,12
D．8,12,10