Erik Christensen wrote:Ngreen,
Frequently in assumption questions, it will be impossible to prephrase the correct answer, because there are simply a multitude of unstated assumptions that are necessary for the argument to be true and many of them are not obvious at all. So, the advice I would give you would be that when you are tackling assumption questions, focus more on tools like the Assumption Negation Technique as opposed to prejudging what you expect to see in a correct answer choice.
Let's use the Assumption Negation Technique with answer choice (b). What is the logical opposite of "at least some"? None!! So the negation of answer choice (b) would be that "No rhinoceroses whose horns are periodically trimmed will be able to find mates." Does this create a problem for the argument in the stimulus? Yes!! This method of protecting the survival of the species is problematic if NO rhinoceroses with their horns trimmed will be able to mate.
On the other hand, if we use the Assumption Negation Technique with answer choice (a), it doesn't create any problems for the overall argument. If poachers ARE likely to hunt other animals for their horns if discouraged from hunting rhinoceroses, then that's perfectly fine (and probably a good thing) for the survival of the rhinoceros species.
Let us know if you have any other questions!!!
Erik + powerscore - to Ngreen's point, let's take the logical opposite of A "Most poachers who are discouraged from hunting rhinoceroses ARE likely to hunt other animals for their horns". When you're reading the conclusion in terms of ALL poaching, not just poaching of rhinoceros, this negation does directly attack the conclusion, if read in the way I just described. (i.e. if hunters are likely to hunt other animals for their horns, then you cannot properly conclude that the motivation for [general] poaching would be eliminated.
So although I clearly see why B does directly attack a reading of the conclusion, I don't feel I clearly understand how to avoid the mistake I Ngreen and I described, where we reading the conclusion to address all poaching, not just of rhinoceros.
Can you help?