My friend _______ a volleyball, but she ___________a basketball.

A. doesn't have, have

B. don't have, has

C. doesn't have, has

以下程序的功能是利用指针指向3个整型变量，并通过指针运算找出3个数中的最大值，输出到屏幕上，请填空。
main()
int x,y,z,max,*px,*py,*pz,*pmax；
scanf("%d%d%d",&c,&y,&z);
px=&x; py=&y; pz=&z;pmax=&max;
______；
if(*pmax＜*py) *pmax=*py;
if(*pmax＜*pz) *pmax=*pz;
printf("max=%d\n",max);