2016 Pascal Problem 3

In the diagram, the 5 \times 6 grid is made out of thirty 1 \times 1 squares. What is the total length of the six solid line segments shown?

\textbf{(A)}\ 6\quad \textbf{(B)}\ 12\quad \textbf{(C)}\ 16\quad \textbf{(D)}\ 18\quad \textbf{(E)}\ 20

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Pascal contests here.