13、已知一个指针p指向非空不带头单链表的某一个结点，若p满足条件”p-＞next==NULL”，则p指向单链表的（）结点。

A.p->next==NULL;

B.p==NULL;

C.p==h;

D.p->next==h;

A.p == tail->next

B.p-> next == tail

C.p == tail->next->next

D.p == tail

A.p->next=head;myrear->next=p;head=p;

B.head->next=p;myrear->next=p;head=p;

C.myrear->next=p;head=p;head->next=p;

D.myrear->next=p;head=p;p->next=head;

A.p=s;

B.s->next=p->next;

C.p->next=s->next;

D.s=p;

A.p=s;

B.s->next=p->next;

C.p->next=s->next;

D.s=p;