问一道英文逻辑题

问一道英文逻辑题
Question 13---16
(1) All P and X are N.
(2) All N except P are X.
(3) No P are M.
(4) No R are N.
(5) All M are either X or R.
(6) No Q are X.
13 Which of the following statements must be true if the above six statements are ture?
I.No R are P.
II.Some X are P.
III.Some X are M.
(A) I only
(B) I and II only
(C) I and III only
(D) I,II,and III.
(E) Neither I,II,nor III.
14 Which of the following must be false given the conditions as stated?
(A) No Q are P.
(B) Some Q are neither N nor R.
(C) Some R are X.
(D) All R are M.
(E) Some X are not M.
15 Which of the numbered statements can logically be deduced from one or more of the other statements?
(A) (2) (B) (3) (C) (4)
(D) (5) (E) (6)
16 If statement (2) were shown to be false,which of the following would necessarily be true?
(A) Some M are neither X nor R.
(B) Some P are not N.
(C) Some Q are X.
(D) Some N are neither P nor X.
(E) Either some X are P or some N are neither P nor X,or both.
Either some X are P or some N are neither P nor X,or both 重点翻译一下
首先 第一题选 A
16题 D为什么错？