请大n们解答一下！！

atgdf

an advertisement designed to convice readers of the treat 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.owner of Deluxe automobiles typicaaly keep their cars well maintained

d.since 1970,Deluxe has made fewer changes in the automobiles it manufatures than other car companies have made in their automobiles

e.Deluxe automobile have been selling at relatively stable prices in recent years

答案是B，但我觉得题目中说的是一个比例问题，而答案中说了数量，感觉不能support!!