单项选择题

A、p->next->prev=p->prev;p->prev->next=p->next;free(p);
B、p->next->prev=p->next;p->prev->next=p->next;free(p);
C、p->next->prev=p->next;p->prev->next=p->prev;free(p);
D、p->next->prev=p->prev;p->prev->next=p->prev;free(p);