Biodiesel is best described as which of the following?

• A. A synthetic petroleum-based fuel used for gasoline engines
• B. A non-toxic, biodegradable fuel used for diesel engines processed from domestic renewable resources
• C. An additive used to improve octane
• D. A high-emission synthetic blend

Answer: (B)

Biodiesel is a renewable, biodegradable diesel fuel made from plant oils or animal fats through a chemical process called transesterification. It can be used in diesel engines, often as a blend with conventional diesel, and is non-toxic and biodegradable, which means spills pose less environmental risk. It comes from domestic renewable resources like soybean or canola oil, recycled cooking oil, or animal fats, supporting local energy sources. It is not a synthetic petroleum-based fuel for gasoline engines, not merely an additive to raise octane, and it isn’t described as a high-emission synthetic blend.