有以下程序：　　#include ＜stdlib.h＞　　struct NODE{　　　　int num;　　　　struct NODE *next;};　　main(　)　　{　struct NODE *p,*q,*r;　　　int sum=0;　　　p=(struct NODE *)malloc(sizeof(struct NODE));　　　q=(struct NODE *)malloc(sizeof(struct NODE));　　　r=(struct NODE *)malloc(sizeof(struct NODE));　　　p-＞num=1;q-＞num=2;r-＞num=3;　　　p-＞next=q;q-＞next=r;r-＞next=NULL;　　　sum+=q-＞next-＞num;sum+=p-＞num;　　　printf(“%d\n”,sum);}　　　执行后的输出结果是（ ）。

A．3

B．4

C．5

D．6

A client with paranoid type schizophrenia becomes angry and tells the nurse to leave him alone. The nurse should（）

A. tell him that she’ll leave for now but will return soon.

B. ask him if it’s okay if she sits quietly with him.

C. ask him why he wants to be left alone.

D. tell him that she won’t let anything happen to him.