Lockeport's commercial fishing boats use gill nets, which kill many of the netted fish, including some fish of endangered species. The fishing commission has proposed requiring the use of tent nets, which do not kill fish; boat crews would then throw back fish of endangered species. Profitable commercial fishing boats in similar areas have already switched over to tent nets. The proposal can therefore be implemented without economic harm to Lockeport's commercial fishing boat operators.
Which of the following, if true, casts the most serious doubt on the argument made for the proposal?
偷换概念 Profit不等于no economic harm A 用了tent net后渔船变少了，很可能就是因为蒙受了损失（虽然有点脑补）