Please Help :) - A news magazine article reports that "because plant feedstock used to produce biofuels absorbs carbon dioxide from the atmosphere, biofuels are oftentimes carbon neutral." What assumption underlies this claim?

A. that biofuels are renewable energy sources

B. that the combustion of biofuels does not emit any carbon dioxide

C. that biofuels are a more sustainable energy source than solar or wind

B. that lands cleared for biofuel crops did not store more carbon in their natural states