After all, ______ makes a new invention such a wonderful thing is ______ it allows us to do something we could not do before.[ ]

A. what ; what    

B. that ; that        

C. what; that      

D. that;  what

有以下程序：
#include ＜stdio.h＞
void fun(int p)
int d=2;
p=d++; printf("%d",p);
main()
int a=1;
fun(a);printf("%d\n",a);
程序运行后的输出结果是

A) 32
B) 12
C) 21
D) 22