Doctor: Angiotensinogen is a protein in human blood. Typically, the higher a person's angiotensinogen levels are, the...

shunhe on June 29, 2020

Hi @colleen_,

Thanks for the question! So clearly, the flaw here has to do with the mistake in the causal reasoning, and so the answer choice should deal with (at its core) the causal reasoning. (C) does this, but (B) does not. (B) actually assumes that the author is right about the causal reasoning, when that’s the main flaw in the first place. In other words, the flaw isn’t that “even if this were causal, then this would follow,” the flaw is that it’s not necessarily causal! And either way, we aren’t given any other evidence about these other factors that might fully counteract the effect, so it’s not a flaw for the author to have overlooked these possibilities. And these reasons are why (C) is a better answer choice than (B), and the correct answer.

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