Which Statement About the Muscle Layers of the Human Gut

Which statement about the muscle layers of the human gut is true?

A) Contraction of the longitudinal muscles constricts the gut.
B) The stomach has two layers of smooth muscle, and a third layer of skeletal muscle.
C) The smooth muscle layers are responsible for mixing gut contents and moving them toward the rectum.
D) The circular muscle layer of the stomach is external to the longitudinal layer.
E) The circular muscles shorten the gut.