AMC 8 2012 Problem 19

In a jar of red, green, and blue marbles, all but 6 are red marbles, all but 8 are green, and all but 4 are blue. How many marbles are in the jar? $\textbf{(A)}\hspace{.05in}6 \textbf{(B)}\hspace{.05in}8 \textbf{(C)}\hspace{.05in}9 \textbf{(D)}\hspace{.05in}10 \textbf{(E)}\hspace{.05in}12$