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

Ben-Rubin on June 23, 2019

Not clear on how to get C

Hi, I was just wondering if you could explain how C is an assumption that the argument depends on? The conclusion doesn't actually have to deal with coffee, so C didn't seem to connect to me. Thanks.

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shunhe on December 23, 2019

Hi @Ben-Rubin,

Think about the implications of negating answer C. This would mean that drinking coffee caused blood cell response times to double. But if this is the case, then even if tea drinkers had blood cell response times of half that of coffee drinkers, they would still have normal blood cell response times. In other words, their immune system defenses wouldn't have been boosted at all. Hope this helps!