Argu15题的结论是什么？？

刻与刻UID: 3267296

Recently, butter has been replaced by margarine in Happy Pancake House restaurants throughout the southwestern United States.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

是" This change, however, has had little impact on our customers."
还是最后一句？

shinian1987UID: 2797009

This change, however, has had little impact on our customers

刻与刻UID: 3267296

2# shinian1987

首先谢谢斑竹，其次再问一下：那最后一句是什么？一个assumption？