Why Does the Process of Making Biofuels from Weeds and Other

Multiple Choice

Why does the process of making biofuels from weeds and other plant matter require additional steps?  

A) They contain a higher proportion of cellulose than corn, soy or sugarcane.
B) They contain a lower proportion of cellulose than corn, soy or sugarcane.
C) They contain a higher proportion of starch than corn, soy or sugarcane.
D) They contain a higher proportion of ethanol than corn, soy or sugarcane.
E) They contain a lower proportion of ethanol than corn, soy or sugarcane.