Here's a problem to solve: Which would indicate that a series of fossils represent the evolution of the horse?

Among the 4 following options, which is the correct answer?

- A: All of the fossils were found in the same layers of rocks as horse fossils.
 
- B: All of the fossils are completely identical to horse bones.
 
- C: All of the fossils show similar structures to that of the modern horse.
 
- D: All of the fossils were located in the same place on Earth as horses.
 