问一道新东方蓝皮的解释题~一直没找到原题和解析~~

mazongshuo003

Which of the following most logically completes the argument?
Investigators recently asked dozens of customers, chosen at random coming out of a SuperMario supermarket, what thet had already purchased. The prices of the very same items at the nearest SuperBird supermarket were totaled and compared with the SuperMario total. The SuperBird totals averaged five percent higher than the SuperMario totals. However, this result does not necessary show that customers at SuperBird would save money overall by shopping at SuperMario instead, because?
A. customers who shop on a regular basis at a given supermarket generally choose that store for the low prices offered on the items which they purchase most often
B. for customers with more than 20 items, the SuperBird totals averaged more than five percent higher than the SuperMario totals
C. lots of customers consider factors other than price when they choose the supermarket where they visit most regularly
D. there is little variation from month to month in the overall quantity of purchases made at supermarkets by a given customer
E. none of the people who conducted the research were employee of the SuperMario supermarket




选A，我选的C

bilkentFBA

根据在SM的调查，SM的商品比SB的同类商品便宜，但顾客在SM买东西却不一定比在SB省钱，为什么？答案应该是选跟省钱有关系的。C里没提省钱。A质疑调查方式，因为调查是根据买的东西，可能顾客到某个超市专门买这个超市的便宜货。