But either way…the snorers and the non snorers have the same properties. I’m re-reading the explanation for why C is wrong, and I think the instructors made a mistake. If the snorers and the non snorers all have the same properties…then obviously those properties cannot be a mysterious third factor that causes the snoring! Super frustrated in this explanation; I actually want to report it!

So…C definitely strengthens the argument. If all test subjects are the same age, weight, and health…then that reduces the chance for another X factor to explain the correlation. Because the snorers and non snorers would be the same on all three fronts. So, it reduces the chance for an alternate hypothesis. It doesn’t reduce it as well as the correct answer choice, but that would have been a more compelling lesson: look, both these answer choices strengthen the argument, but one strengthens better!

Unless there is something I’m missing entirely here.

Still not understanding how #3 is not an argument. If linguists are doing comparative analyses of traditional languages, there is a reasonable “assumption” that there are languages across multiple eras and cultures. That definitely supports human communication being universal. It’s a horrid argument, don’t get me wrong. It doesn’t prove that all cultures and eras everywhere have have language, and it is after all based on an assumption. But it still supports the conclusion. It’s truthfulness does make communication universality more true, as LACK of comparative analyses would strengthen the idea that human communication is NOT universal.