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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
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