Thanks for the question! So first, we have to figure out what’s going on in this stimulus. The argument starts off by saying that people who say that Donoey County is flat are wrong (which is the conclusion). Why? Because soil erosion by water isn’t a problem on flat land. So farmers with flat land don’t build terraces to prevent erosion. But the author hears that the farms there are dotted with terraces.
So now we have to find an argument that’s most similar to the reasoning in the passage. Well, to look at the reasoning from a more abstract angle, what is the reasoning in the passage? When X happens, Y doesn’t happen. And when Y doesn’t happen, you don’t need Z. But there’s Z in this place. So X isn’t happening in this place. We want something that parallels that kind of logic.
So now take a look at (C), which tells us that people who get a lot of exercise fall asleep easily, and so people who get a lot of exercise don’t use medications to help them fall asleep. Jack’s taking lots of medication, so he’s not getting a lot of exercise. And we can see that this is the same! When X happens (you get a lot of exercise), Y doesn’t happen (you don’t have problems falling asleep). When Y doesn’t happen, you don’t need Z (medications). But this human (Jack) exhibits Z (medication taking), so this human must not exhibit X (getting a lot of exercise). This matches perfectly, and so is the correct answer. The other answer choices, when you try to match them up, simply don’t exhibit this kind of reasoning.
Hope this helps! Feel free to ask any other questions that you might have.