请教一道LSAT题？

you5460

10. Almost all of the books published in the past 150 years were printed on acidic paper. Unfortunately, every kind of acidic paper gradually destroys itself due to its very acidity. This process of deterioration can be slowed if the books are stored in a cool, dry environment. Techniques, which are now being developed, to deacidify books will probably be applied only to books with historical significance.
If all of the statements in the passage above are true, which one of the following must also be true!
(A) If a book was published in the past 50 years and is historically insignificant, it will probably deteriorate completely.
(B) Almost all of the books published in the past 150 years will gradually destroy themselves.
(C) Almost all of the books that gradually deteriorate are made of acidic paper.
(D) If a book is of historical significance and was printed before 150 years ago, it will be deacidified.
(E) Books published on acidic paper in 1900 should now all be at about the same state of deterioration.
answer:A
请问D选项如果在will后加一个probably，也是一个正确答案呢？

kuuiytt

No, it will not. The reason is that whether paper of before 150 years ago is acidic or not. By using "probably", you are expressing 80% certainty that the paper is acidic. The assertion is not warranted based on the adgument.

If D is change to "If a book ... 150 years ago, it might or might not be deacidified", I would say it is an answer.

you5460

many  thanks  !!