by christine.defenbaugh Thu Apr 03, 2014 2:36 pm
As always, you raise an interesting question WaltGrace1983!
I'll give you two answers:
Practical/Strategic Answer
When you are looking for a strengthen answer, the difference between wrong answers that weaken, and wrong answers that are irrelevant is best discussed over wine, late at night, alongside some esoteric philosophical concepts.
In other words, far away from the actual LSAT. And I say that not just because the answer to the question doesn't affect your TASK, though that's true. It's also because the writers of the LSAT likely did not spend a great deal of time categorizing the incorrect answers specifically as either weaken or irrelevant.
The LSAT is an extremely carefully written exam, and the writers of it will make absolutely certain that the line between the correct strengthener and an irrelevant answer is clearly defined. But they aren't likely to take that care between incorrect irrelevant answers and incorrect weaken answers - why would they? As a result, a wrong answer to a strengthen question might easily debatably be either irrelevant or weakening.
Language is not in and of itself precise - the language of the LSAT only falls into precise patterns and structure because the writers have made it so.
Now, I'll go ahead and give you another answer, because I like wine, late nights, and esoteric philosophical debates.
One major assumption that is getting made here is that the new synthetic ivory won't be used (or used much) outside the piano market. (And (D), of course, supports that assumption.)
(B) raises a positive of the new synth-ivory in comparison to real ivory. The fact that it well mimics the thing it is meant to replace makes it every so slightly more likely that rest of the ivory market will actually like it.
So, I'd agree with you that (B) weakens the argument just a tad by making it less likely that the new synth-ivory won't help reduce poaching.
(E) however, is slightly different. This raises a positive of the new synth-ivory in comparison to prior synth versions. But is it cheaper than real ivory? Were the old synth versions cheaper than real ivory?
I can see arguments on both sides for this one: one might say that the reduction in cost from old-synth to new-synth must surely make it at least a tad more likely to get new some people to switch from the real stuff. But one might also argue that if the synth versions were actually still more expensive than real ivory, it wouldn't make it any more likely to get new switchers - and as a result, this would only weaken the argument if you make some additional assumptions.
If I had a gun to my head, I'd say they both weaken the argument a bit, but that (B) weakens it a bit more. Fortunately, though, we don't have a gun to our head, and the LSAT does not ask us to make these kinds of hairsplitting distinctions to get to correct answers!