Animal feed should not include genetically modified plants. A study found that laboratory rats fed genetically modifi...

shunhe on July 21, 2020

Hi @elawrencehenderson,

Thanks for the question! So let’s recap the argument. We’re told the conclusion first: animal feed shouldn’t include GMO plants. Why? Because rats that got fed GMO potatoes had intestinal deformities and a weakened immune system, and rats that ate a normal diet that wasn’t GMO didn’t get these problems.

Now we’re looking for something that weakens the argument, so something that would make us think that GMO foods might be ok in animal feed. Now take a look at (D), which tells us that GMO potatoes have the same nutritional value as potatoes that aren’t GMOs. Sure, this might weaken the argument a little bit, by telling us that at least the GMO foods aren’t nutritionally void. But it doesn’t help quell any fears about other problems with GMOs, like maybe the fact that they’re GMOs will increase your chance of cancer or something. So since (D) might weaken, but only a little, it’s not the best answer (especially when compared to (A)), and remember that on the LSAT we’re always looking for the best answer. So (D) isn’t the correct answer choice here.

Hope this helps! Feel free to ask any other questions that you might have.