I think it's the femur, but in the choices the best one might be the Pelvic Bone.
Answer:
about stomach
Explanation:
The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion. The pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.
