Which of the following would most likely happen if the epithelial cells in the stomach failed to produce mucus?
a. gastric juice would digest the stomach lining, resulting in ulcers.
b. food leaving the stomach would only be partially digested.
c. stomach ph would increase, resulting in acid reflux disease.
d. the cells would break down more slowly in order to protect the stomach.

I think the correct answer would be A. If the epithelial cells in the stomach failed to produce mucus, then the gastric juice would digest the stomach lining, resulting in ulcers.   The mucus that are produced by specialized epithelial cells aids in the protection of the stomach lining from the juices that are acidic. Thus, without this mucus, the lining would be damage and would cause stomach problems.

3. is true i think i should be right

That's false, when you're born your skull has not fused together yet.