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题目：
The following appeared in a memo from the marketing director of Top Dog Pet Stores.
"Five years ago, Fish Emporium started advertising in the magazine Exotic Pets Monthly. Their stores saw sales increase by 15 percent. The three Fish Emporium stores in Gulf City saw an even greater increase than that. Because Top Dog has some of its largest stores in Gulf City, it seems clear that we should start placing our own ads in Exotic Pets Monthly. If we do so, we will be sure to reverse the recent trend of declining sales and start making a profit again."
Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.
中文翻译：
五年前，F商店开始在EP月刊杂志上做广告，此后其销售额上涨了15%。G市的三家F商店增长更为明显。因为TD宠物商店就座落在G市，看起来很明显我们应该开始在EP月刊上做广告了。如果这样做，我们一定会扭转最近的销售颓势并且在此盈利。
写一篇回应，在其中讨论一个或数个可以和文中的解释相竞争的他种解释(原因)，并说明你提出的解释是如何可信的解释和说明文中呈现的事实的。