The incident __ a driver who accidentally killed a pet dog was made to kneel before the dead animal for

an hour by its owner shocked many people.[ ]

A. which

B. what

C. when

D. where

以下程序的输出结果是( )。
int f()
static int i=0;
int s=1;
S+=i;i++：
return s;
main()
int i,a=0;
for(i=0;1＜5;i++)a+=f()；
printf("%d\n"，

A．;A) 20B) 24C) 25D)