Which substance is commonly used to produce biomass fuel?

corn stalks

yellowcake

coal

natural gas

Corn stalks

Explanation:

Biomass fuel is produced by living or once-living organisms.

The most common biomass fuels used for energy come from plants, such as corn and soy.

B is wrong. Yellowcake is a refined form of uranium ore.

C and D are wrong. Coal and natural gas are not biomass fuels.