C
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
When a dog smells food and begins drooling, it is responding to an external stimulus. Which of these describes a response to an internal stimulus?

### Choices:
A. A cat sees a mouse and crouches.
B. A parrot hears a name and repeats it.
C. A person eats spoiled food and vomits.
D. A worm senses water and moves to the surface.

### Answer:
