Final answer:
The normal pH range for the stomach is between 1.0 to 3.0, which is highly acidic. This falls under option c in the given choices.
Step-by-step explanation:
The normal pH range for the stomach is highly acidic, falling between 1.0 to 3.0, which corresponds with option c of the provided choices. The pH scale itself ranges from 0 to 14, where any pH value below 7 is considered acidic and any pH value above 7 is alkaline. As a comparison, water is neutral with a pH of 7, while human blood is slightly alkaline with a normal pH range of 7.35 to 7.45. The acidic environment of the stomach is essential for digestion, but it also requires the stomach lining to regenerate frequently, as the cells are unable to maintain their integrity in such an environment and are constantly being replaced.