题目选项分析

Investing in fishing-boats could be very profitable at this time. A survey made by "Hook, Line and Sinker" magazine shows that 75 percent of the magazine's readers want to buy a new fishing-boat during the summer. However, fishing-boat manufacturers can only produce enough boats to satisfy 30% of total potential buyers.

Which of the following, if true, reveals a weakness in the evidence cited above?

【选项】"Hook, Line and Sinker" magazine includes both articles about fishing and articles about building fishing-boats.