42. Most biofuels are made from agricultural products such as corn, wheat, sugarcane, and palm oil. Wastes such as fats and cooking oils from restaurants can be collected and recycled into a biofuel, too. They are all renewable. Advocates of biofuels claim that using biofuels instead of regular fuels decreases the emissions of some greenhouse gases. However, some studies show that using biofuels increases the emission of nitrogen oxide, a notorious greenhouse gas. ____________ At present, whether biofuels can be called the next great energy source is still controversial.
(A) Farmers benefit greatly from the huge demand for biofuels.
(B) Do the advantages of biofuels outweigh the disadvantages?
(C) That sounds like fantasy.
(D) Poor people barely have enough money to buy agricultural products.

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