products sold under a brand name used to command premium prices because, in general, they were suporior to nonbrand rival products. Technical expertise in product development has become so widespread, however, that special quality advantages are very hard to obtian there days and even harder to maintain. As a consequence, brand name products generally neither offer higher quality nor sell at higher prices. Paradoxlly, brand names are a bigger marketing advandage than ever.

which of the follwoing , if true,most helps to resolve the paradox outlined above?

a brand names are taken by comsumers as a guarantee of getting a product as good as the best rival products.

b commsuers recognize that the quality of products sold under invariant brand names can drift over time

c in many acquisition of one corportation ,the acquring corporation is interested more in acquiring the right to use certain brand names than acquring existing productuion facilities

d in the days when special quality advantages were easier to obtain than they are now , it was also easier to get new brand names established

c the adversting of a company's brand name products is at times trandsfered to a new advertising agency, especilly ,when sales are decliing

这道题的题意,看懂了，可是选响a跟上文的关系怎么都理解不了??

原文说原来品牌商品质量更好，但现在技术扩散non-brand product也有了很好的质量，但品牌商品仍然有很大的市场优势。

A说消费者已经形成了思维定式：品牌商品的质量更好。刚好解释了paradox.