Hunter: Hunters alone are blamed for the decline in Greenrock National Forest’s deer population over the past ten years. Yet clearly, black bears have also played an important role in this decline. In the past ten years, the forest’s protected black bear population has risen sharply, and examination of black bears found dead in the forest during the deer hunting season showed that a number of them had recently fed on deer.

In the hunter’s argument, the boldface portion plays which of the following roles?

1. It is the main conclusion of the argument.
2. It is an objection that has been raised against the main conclusion of the argument.
3. It is a judgment that the argument opposes.
4. It is a finding that the argument seeks to explain.
5. It provides evidence in support of the main conclusion of the argument.

参考答案是A。D为什么不对?很多人问这个问题可是似乎没有人回答啊

Note that the question asks "In the hunter's argument", so we need to look at what the ARGUMENT really is. Or put it another way, why does the hunter bother to put together such an argument in the first place? He really wants to counter the claim that hunters ALONE should be blamed for the decline in deer population. To do so, he proposes an alternative cause for such decline, that is, black bears ALSO played an important role. Therefore, the BF statement is what the hunter, or the arguer, wants to conclude. He doesn't simply mention this as a finding so that he can explain it. Therefore, D is incorrect.