Despite the approach of winter， oil prices to industrial customers are exceptionally low this year and likely to remain so. Therefore， unless the winter is especially severe， the price of natural gas to industrial customers is also likely to remain low.

Which of the following， if true， provides the most support for the conclusion above？
　
（A） Long-term weather forecasts predict a mild winter.
（B） The industrial users who consume most natural gas can quickly and cheaply switch to using oil instead.
（C） The largest sources of supply for both oil and natural gas are in subtropical regions unlikely to be affected by winter weather.
（D） The fuel requirements of industrial users of natural gas are not seriously affected by the weather.
（E） Oil distribution is more likely to be affected by severe winter weather than is the distribution of natural gas.
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The argument clearly states that "unless the winter is especially severe， the price of natural gas to industrial customers is also likely to remain low", So it is possible that if the winter is sever the price can change, which cannot be justified by option C

Premise 1 - Despite the approach of winter， oil prices to industrial customers are exceptionally low this year and likely to remain so.
Conclusion - unless the winter is especially severe， the price of natural gas to industrial customers is also likely to remain low.

Any option which link the premise and conclusion is our answer i.e. here it should link oil with natural Gas

Option B does the job perfectly.


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First off, I want to stress that this question is actually not MUst-be-true one. It is actually a 'Straighten' question type.
As for the question, the correct answer is B

Premise-Despite the approach of winter， oil prices to industrial customers are exceptionally low this year and likely to remain so.
Conclusion -Therefore， unless the winter is especially severe， the price of natural gas to industrial customers is also likely to remain low.

Even if u cant understand which one is the conclusion by simply reading the argument, the word "therefore" is a great indicator of having a conclusion.
So, if u see that a sentence begins with the word "therefore", be sure that this sentence is a conclusion.

As we can see the premise says about the oil prices, but the conclusion is made about the gas prices. So, we have some logical gap between these two. In order to link these two sentence, we need an answer choice, that will have this link and by doing so, will definitely strengthen the passage above.

answer choice B states that the industrial users who consume most natural gas can quickly and cheaply switch to using oil instead.
the answer choice links gas with oil. it means that if the oil prices are low, the gas prices will also be low.
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Chose C but now can see why B is correct.