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when compared to petrodiesel, biodiesel:
a. has a lower cetane rating.
b. has a lower cloud point and pour point.
c. produces significantly fewer emissions.
d. produces more harmful emissions.

Explanation:

• Biodiesel has a higher cetane rating than petrodiesel. Cetane rating measures ignition quality.
• Biodiesel has higher cloud and pour points compared to petrodiesel. Cloud point is the temperature at which wax crystals start to form, and pour point is the temperature at which the fuel stops flowing.
• Biodiesel is a cleaner - burning fuel. It produces fewer emissions such as particulate matter, sulfur oxides, and un - burned hydrocarbons compared to petrodiesel.
• Option d is incorrect as biodiesel produces less harmful emissions.

Answer:

C. Produces significantly fewer emissions.