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OK, I think I got it now. I was also between choosing A and B...
What B is saying is that almost all books published...will gradually destroy themselves, but the statements in the passage do not mention if most books published then are considered historical or not. Therefore, we can't know for sure if most or just a small fraction of the books will be saved.
A clears this up, not by mentioning how many of them are historical, but by simply stating that if X and Y are true, then C will happen (deteriorate).
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. (E) Books published on acidic paper in 1900 should now all be at about the same state of deterioration.
For whatever it's worth - I had chosen A. And I had discarded B because it says almost all books published in the past 150 yrs will gradually destroy themselves ---- SAVE however the books (if any) with historical significance WHO THE STEM SAYS WILL BE PRESERVED --- so this stmt has at least ONE untrue condition.