C. railroad...............
So as to find the pattern repeat. Patterns are why we do what we do, the way we do them & how we do them, while observing who we'd most like to be or look like or have the possessions of.
Explanation:
Color is a very useful attribute to depict different features on a map. Typical uses of color include displaying different political divisions, different elevations, or different kinds of roads.
They're a shallow ocean habitat, filled with sea life and made of thin layers of calcium carbonate.