[求助] XDF 11-20

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 ture, provides the most support for the conclusion above?

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.

答案给了b. 本人觉得c也对。

请各位指教