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In one study, hospital patients’ immune systems grew stronger when the ... ...

In one study, hospital patients’ immune systems grew stronger when the patients viewed comic videos. This indicates that laughter can aid recovery from illness. But much greater gains in immune system strength occurred in the patients whose tendency to laugh was greater to begin with. So hospital patients with a greater tendency to laugh are helped more in their recovery from illness even when they laugh a little than other patients are helped when they laugh a greater amount.

The argument is most vulnerable to criticism on the grounds that it

(A) overlooks the possibility that the patients whose tendency to laugh was greater to begin with laughed more at the comic videos than did the other patients
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT72 (Jun 2014): Logical Reasoning B

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