单项选择题

有如下类声明：
class MyBASE
int k;
public:
void set(iht n)k=n;
int get()coastreturn k;
;
class MyDERIVED:pnoted My BASE

protected:
int j;
public:
void set(int m，int n)MyBASE::set(m);j=n;
int get()constreturn MyBASE::get()+j;
;
则类MyDERIVED中保护的数据成员和成员函数的个数是
A)4 B)3 C)2 D)1