[讨论]The answer is unbelieveable

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 150 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.（A）

(E) Books published on acidic paper in 1900 should now all be at about the same state of deterioration.

The answer is A?!

A doesn't cover all the information listed. Can it be used as conclusion of " must be true"?

I thought D is better. Open to discuss. Thanks.

(A) If a book was published in the past 150 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.（A）

(E) Books published on acidic paper in 1900 should now all be at about the same state of deterioration.

(D) is wrong because the last sentence of the passage said "Techniques,
which are now being developed, to deacidify books will probably be
applied only to books with historical significance."  The techniques, even if developed sucessfully, will only apply to some of books with historical significance.  When see answers with "extreme words" such as all, will, must, none, etc. Be careful.