In physiology,you learned that form reflects function.When comparing the digestive systems of carnivores and herbivores,you observed that

A)carnivores have much larger stomachs than herbivores.
B)carnivores have a much smaller caecum,and a much shorter intestinal tract than herbivores.
C)carnivores have a smaller caecum,but a larger intestinal tract than herbivores.
D)the digestive systems of the two are similar because both are mammals.