以下程序的输出结果为( )#include class Sample{public: Sample(){} Sample(int a){x=a;} Sample(Sample &a){x=a.x++;} void disp(){coutprivate: int x;};void fun(Sample &s1, Sample s2) { s1.disp ();s2.disp ();}void main(){ Sample s1(2),s2=s1; fun(s2,s1); s1.disp ();s2.disp ();}
选项：

A:2433
B:2343
C:2333
D:2344