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

### Question:
Rhinoceroses and horses are related. They have very similar digestive systems and an odd number of toes on their feet. Horses have one toe, and rhinoceroses have three. These facts best support which claim?

### Choices:
A. Horses and rhinoceroses share a common ancestor.
B. Horses and rhinoceroses are genetically identical.
C. Horses are the ancestors of modern rhinoceroses.
D. Horses have descended from modern rhinoceroses.

### Answer:
