Despite the advent of winter, the price of oil used by industrial consumers is particularly low this year and is likely to continue, so unless the winter is particularly cold, the price of natural gas used by industrial consumers may also remain low. Which of the following, if true, best supports the above conclusion? ['Long-term weather forecasts predict a mild winter.', 'Industrial users who consume large amounts of natural gas can quickly and cheaply switch to using oil as an alternative.', 'The largest sources of supply for both oil and gas are in subtropics and are unlikely to be affected by climate.', 'Oil sales are more vulnerable to severe weather than natural gas sales.']