In the Evolution of Digestive Systems

In the evolution of digestive systems

A) cnidarians (corals, anemones and jellyfish) have simple sac-like guts with only a mouth and an anus.
B) sponges have the simplest gut, called a spongocoel, with a mouth, called an osculum, and an anus, called an ostium.
C) nematodes are the simplest animals to manifest a one-way digestive tract.
D) development of peristatsis in tapeworms allowed movement of food through the gut, independent of body movements.
E) organisms with a coelom are most likely to have the longest and most complex guts.