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prasannar
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im joining th B gang

The problem or flaw with the argument is that he is saying

We will be able to solve the problem we face, therefore, only if we adopt this plan.

So he is ruling out every other option. Why though? What in the argument states that another plan couldn't work either? Why is his plan the only one to solve the problem?
What if there were other ways to reduce expenditures in another plan?

Therefore in B, he is confusing what could be an adequate solution to a required solution (ONLY is key here)
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I solved it right, but used different reasoning than the one proposed here. I wasn't thinking that he is ruling out all the other ways by using the word "only". In my opinion, the B) isn't hinged on that fact, E) is somehow more.

Instead, I asked who said that the whole one billion has to be recovered? This is the difference which the B) tells us about - the difference between an adequate solution (regaining the whole one billion which would be just perfect) and the required solution (maybe it would be enough to recoup 50% of the shortfall next year? If YES, the whole argument falls apart).

Why not E)? I think that because E) reads "there is no way to increase...", and the Commissioner says that "there is no feasible way to increase...". Besides, the flaw appointed in B) trumps the one in E), as with E) true, the argument remains valid (the problem still exists), and with B) true, it does not.

Please correct me if I'm wrong.
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Necessity vs sufficient condition
So ans is B
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