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Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
Hi - two quick questions

Even though not an available option - i was wondering if this was also weakener (i was expecting this)

Quote:
 (option F) In the autumn, all the insects disappear underground - Thus insects are not accessible in the autumn


#2

Quote:
 Would you agree that option C does raise a follow-up. How much is the net calories gained if the hermits have insects vs. net calories gained if the hermits have berries. We need to compare this

Given we don't know this information -- C can't be chosen
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Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
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jabhatta2 wrote:
Hi - two quick questions

Even though not an available option - i was wondering if this was also weakener (i was expecting this)

Quote:
 (option F) In the autumn, all the insects disappear underground - Thus insects are not accessible in the autumn


#2

Quote:
 Would you agree that option C does raise a follow-up. How much is the net calories gained if the hermits have insects vs. net calories gained if the hermits have berries. We need to compare this

Given we don't know this information -- C can't be chosen

Regarding the additional answer choice: adding in your own options generally isn't worth the time. It can actually hurt your accuracy in answering the question, because instead of just assessing the options on the page, you're (on some level) trying to find the answer that you've developed yourself. This can cause you to overlook options -- like (C) -- that are correct, but don't match your "expected" answer.

For your second question: we're trying to find the answer choice that "most seriously calls into question the explanation given for the thrush’s diet during migration." So, we don't need an option that utterly destroys the explanation -- we just need one that calls it into question more than the other options do.

(C) does exactly that: by even raising the issue of net calories, it casts some doubt on the nutrient-based explanation. Perhaps, on balance, birds actually get more calories from eating berries than from eating insects. You're right that we don't know this for sure without additional info -- but it does provide us a reason to question the author's explanation. None of the other answer choices do that, so (C) is the correct answer.

I hope that helps!
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Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: Most of the year, the hermit thrush, a North American songbird, eats [#permalink]
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