Questions: Which type of water feature occurs when groundwater interacts with or comes to the surface?

The answer is the third one (or C): a natural spring.

Explanation for each option: A. Human-made swimming pool: This is incorrect because a swimming pool is an artificial structure created by humans and does not involve groundwater naturally coming to the surface. B. The ocean: This is incorrect because the ocean is a large body of saltwater that covers most of the Earth's surface and is not directly related to groundwater coming to the surface. C. A natural spring: This is correct because a natural spring occurs when groundwater flows naturally to the Earth's surface, often due to pressure or geological formations.

Summary: A natural spring is the type of water feature that occurs when groundwater interacts with or comes to the surface.