Use $\subseteq, \nsubseteq, \subset$ , or Both $\subset$

Multiple Choice

Use $\subseteq, \nsubseteq, \subset$ , or both $\subset$ and $\subseteq$ to make a true statement.
-{All states west of the Rocky Mountains} _____ {All states west of the Atlantic Ocean}

A) $\subset$ and $\subseteq$
B) $\nsubseteq$
C) $\subseteq$
D) $\subset$