The actual answer is, "A", an ocean trench.
You can find out more about them by researching them up on Google, it's only a few phrases and a hit on the enter key :P
Answer:
reversed peristaltic action of the intestines, by which their contents are carried upward.
Explanation:
It is true that all of the bones in your body, with the exception of the hyoid joint in the neck, form a joint with another bone.
