Choice A reason:

This statement is correct. Hernias occur when an organ, such as the intestine or abdominal tissue, protrudes through a weakened area in the muscle or connective tissue.

Choice B reason:

This statement is correct. Heavy lifting, straining during bowel movements, or activities that increase intra-abdominal pressure can contribute to the development of hernias.

Choice C reason:

This statement is incorrect and indicates a need for further teaching. Not all hernias are visible as bulging lumps under the skin. Some hernias may not be externally noticeable and are diagnosed through imaging studies.

Choice D reason:

This statement is correct. Surgery is often the primary treatment for most types of hernias to repair the weakened area and prevent complications.