Contrary to earlier predictions, demand for wine has not increased in recent years. Yet, even though prices and production amounts have also been stable during the last three years, wine producers last year increased their profits by more than 10 percent over the previous year's level.
Any of the following statements, if true about last year, helps to explain the rise in profits EXCEPT:
【选项】
The price of oil, the major energy source used by wine producers in harvesting their crops, dropped by over 20 percent.
选项是否正确？