To insert s after p in a doubly linked circular list, we must do:

A、P->next=s; s->prior=p; p->next->prior=s ; s->next=p->next;
B、P->next->prior=s; p->next=s; s->prior=p; s->next=p->next;
C、S->prior=p; s->next=p->next; p->next=s; p->next->prior=s;
D、 `s->prior=p; s->next=p->next; p->next->prior=s; p->next=s;`