A recent study showed that the immune system blood cells of the study's participants who drank tea but no coffee took...

Ryan on October 22 at 02:54PM

Why is C correct? Why is D incorrect?


1 Reply

Andrea on October 23 at 07:15AM

Hi @ryan-mahabir,

Good question. C is correct because if in the study drinking coffee caused the blood cell response time to double, it casts some serious doubt on the plausibility of the conclusion. So the argument is relying on the fact that the situation described in C didn’t take place, which makes it a necessary assumption of the argument.

For D, likelihood to exercise or eat healthy on the part of coffee drinkers doesn’t have any effect on our conclusion. “Drinking tea boosted participants’ immune system defenses” isn’t relying on the truth of that information.

Hope this helps!