Which of these sentences is capitalized​ correctly?

A.
In the​ winter, the town is filled with skiers who come for the beautiful Rocky Mountains.
B.
In the​ winter, the town is filled with skiers who come for the beautiful rocky mountains.
C.
In the​ winter, the Town is filled with skiers who come for the beautiful rocky mountains.
D.
In the​ Winter, the town is filled with skiers who come for the beautiful Rocky Mountains.