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manasveek
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I chose answer A, because I thought that A eliminates possibilities that other factors were involved that could have affected the study. Can anyone clarify how A could be eliminated?

IMO, A is already stated in the argument.
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As a general question....can practice on LSAT question help in gmat CR?
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Mansoor50, yes. And bumping for further discussion.
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A recent study showed that the immune system blood cells of the study's participants who drank tea but no coffee took half as long to respond to germs as did the blood cells of participants who drank coffee but no tea. Thus, drinking tea boosted the participants' immune system defenses.

Which one of the following is an assumption on which the argument depends?

.(A)  All of the participants in the study drank either tea or coffee, and none drank both.

.(B)  Coffee has no health benefits that are as valuable as the boost that tea purportedly gives to the body's immune system.

.(C)  In the study, drinking coffee did not cause the blood cell response time to double.

.(D)  Coffee drinkers in general are no more likely to exercise and eat healthily than are tea drinkers.

.(E)  Coffee and tea do not have in common any chemicals that fight disease in the human body

One may think of a possible assumption that blood cell response time in participants who drank tea didn't halved but if that is so then the question would have been easy. On the contrary, C says the opposite of above, making it difficult to answer.
Only A and C look good but A loses for considering participants who may/may not have drank both i.e. increasing the scope of participants of experiment.

Answer C.
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Does someone become faster because their rival has becomes slower? That's kind of what could be happening here. What if tea didn't boost one's immune system but coffee slows it down?

(C) is the answer. If we negate it, we get: In the study, drinking coffee DID cause the blood cell response time to double.

This would be devastating for the argument.
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