Here's a problem to solve: Rat snakes, Elaphe obsoleta, are a species made of many distinct populations in different areas. Each of the populations has different markings and colorings. Where would rat snakes most likely be gray?

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

- A: in a forest
 
- B: in a swamp
 
- C: in a gravel pit
 
- D: in a corn field
 