In recent years, the demand for biofuels has increased rapidly. Global ethanol production tripled between 2000 and 2007, and its output will double again by 2017, and biodiesel production will more than double within 10 years. It is produced by grain, sugar and oil crops such as corn, so the expansion of its output will inevitably lead to soaring prices of related crops. If the above view is correct, you can deduce:. ['Rising agricultural product prices will lead to lower biofuel production.', 'If the price of agricultural products falls, then biofuel production has not increased.', 'If the production of biofuels declines, then the price of agricultural products will increase.', 'Increased production of biofuels such as ethanol is affected by low agricultural prices.']