Because Most Herbivores Do Not Produce Cellulase, They Have Specialized

Because most herbivores do not produce cellulase, they have specialized compartments in their digestive tracts that:

A) provide appropriate temperature and pH for breaking down plant material.
B) house large populations of bacteria that do produce cellulase.
C) grind up the plant material using muscular gizzards or other structures.
D) secrete alternative enzymes that carry out the same function as cellulase.
E) ferment nutrients in the hindgut.