GMAT Sentence Correction (SC) | Re: Q29. The army cutworm moth is a critical source of fat for

these both explain aprroxmately same meaning , infact as many as means 'upto' or 'exactly' . But the problem in sentence B is

The army cutworm moth is a critical source of fat for many
of Yellowstone National Park’s grizzly bears; they overturn
rocks to find them and consuming as many as 40,000 apiece
in a single day.


B. bears; overturning rocks to find the insects,
...

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