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Technological improvements and reduced equipment costs have

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Technological improvements and reduced equipment costs have [#permalink] New post 16 Jul 2011, 13:30
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90% (01:50) correct 10% (00:53) wrong based on 10 sessions
Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade. However, the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars.

Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its threshold of economic viability?

(A) The cost of oil has fallen dramatically.
(C) Technological changes have increased the efficiency of oil-fired power plants.


Hi,

I read a few forums on this question but yet haven't found a reason why A is wrong and C is better. Is the issue with the word "Dramatically" cause I can easily come up with many reasons to dispute C too.
[Reveal] Spoiler: OA
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Re: CR Question [#permalink] New post 16 Jul 2011, 18:54
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Discussed many times: technological-improvements-and-reduced-equipment-82828.html

Please post more descriptive subject!
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Re: CR Question   [#permalink] 16 Jul 2011, 18:54
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