题目：
"Recently， butter has been replaced by margarine in Happy Pancake House restaurants throughout the southwestern United States. This change， however， has had little impact on our customers. In fact， only about 2 percent of customers have complained， indicating that an average of 98 people out of 100 are happy with the change. Furthermore， many servers have reported that a number of customers who ask for butter do not complain when they are given margarine instead. Clearly， either these customers do not distinguish butter from margarine or they use the term 'butter' to refer to either butter or margarine."
Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation（s） can plausibly account for the facts presented in the argument.
中文翻译：
Happy Pancake House 在美国西南部的餐厅用人造黄油代替了天然黄油。但是这种改变对顾客的影响非常小因为只有大约2%的顾客投诉，这说明100 个人中有98 人对于这种替换是乐于接受的。而且，很多服务生报告说很多仍然要了天然黄油的顾客在被给予人造黄油的时候并没有投诉。显然，这些顾客要么分不清天然黄油和人造黄油，要么是用"天然黄油"这个词汇来指天然黄油或人造黄油。
写一篇回应，在其中讨论一个或数个可以和文中的解释相竞争的他种解释（原因），并说明你提出的解释是如何可信的解释和说明文中呈现的事实的。
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