The Muscularis Layer in the Wall of the Digestive Tract

The muscularis layer in the wall of the digestive tract is

A) skeletal muscle throughout the tract, especially in the large intestine.
B) the layer of the digestive tract wall that contains capillaries.
C) in direct contact with the food that is consumed.
D) composed of a layer of circular smooth muscle fibers and a layer of longitudinal smooth muscle fibers.
E) connective tissue and the peritoneum.