OG上的一道题目不理解，求解答谢谢！

haiwen

OG 12th edition的Diagnostic Test上面逻辑部分第34题的解答（pg 92），关于tuna fish的促销成功与否问题：

B. Most of the ppl who bought Dietz's canned tuna...were already loyal customers of other Dietz products.

个人认为这个也可以说得通，customer bought the canned tuna because of the campaign, found it was actually pretty good, then figured out it might be a good idea to try some other Dietz products...相当于一个品牌延伸效应？但是OG解答说if the customers bought the tuna because of the campaign, it's irrelevant to the argument that they also bought other Dietz products. 这个到底咋个理解法？求解答，谢谢！

chasingM7

pls paste the entire question