need help on one CR/大全-2-12

An advertisement designed to convince readers of the

   great durability of automobiles manufactured by the

   Deluxe Motor Car Company cites as evidence the fact

   that over half of all automobiles built by the company

   since 1970 are still on the road today, compared to

   no more than a third for any other manufacturer.

   Which of the following, if true, most strongly supports

   the advertisement’s argument?

   (A) After taking inflation into account, a new Deluxe

       automobile costs only slightly more than a new

       model did in 1970.

   (B) The number of automobiles built by Deluxe each

       year has not increased sharply since 1970.

   (C) Owners of Deluxe automobiles typically keep

       their cars well maintained.

   (D) Since 1970, Deluxe has made fewer changes in

       the automobiles it manufactures than other car

       companies have made in their automobiles.

   (E) Deluxe automobiles have been selling at rela-

answer is b). unfortunately, i put d)

i am still confused...' The number of automobiles built ' matters more about the quality than d)...?  

请注明出处，以便后来人搜索，其实这道题已讨论过，你搜索以下。

B 假设型支持。取非：如果D生产的汽车逐年增加，那现在还在路上跑的车中，越靠近现在的版本比例越大，说不定都是新车，这样结论（D生产的车耐用）就不成立。