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Argument advocates a lower calorie diet for N. Americans by citing an eg. of a lab animal.
Researchers don't agree with the claim & mention that lab animals eat more than other animals & that restricting their diet just brings them back to normal.
Researcher's arg. can be weakened if we can show that N.Americans are similar to lab animals in their eating habits & that they eat more than reqd.
"A" does exactly that.
Hope this helps.
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