Compared to Carnivores, Herbivores Tend to Have _______ Assimilation Energies

Compared to carnivores, herbivores tend to have _______ assimilation energies because _______.

A) lower; they are larger in size
B) lower; plants contain many substances, such as cellulose, that are not easily digested
C) higher; they are smaller in size
D) higher; plants contain many substances, such as cellulose, that are not easily digested