求教argument 15

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"Recently, butter has been replaced by margarine in Happy Pancake House restaurants throughout the southwestern United States.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.

写作指引说讨论其他可能的解释，想请教一下各位这里到底要解释什么啊？我是这样理解的：观察到的现象是2%的顾客满意，文中给出的解释是吧butter换成margarine没有影响所以很少有顾客投诉。如果是这样的话，题目是要求想出其他原因来解释为什么顾客的投诉很少吗？