A certain cylinder has height 2 and base circumference 16. Its three-view diagram is shown on the right. Point $M$ on the cylinder surface corresponds to point $A$ in the front view, and point $N$ on the cylinder surface corresponds to point $B$ in the left view. Then on the lateral surface of the cylinder, the length of the shortest path from $M$ to $N$ is
A. $2 \sqrt { 17 }$\\
B. $2 \sqrt { 5 }$\\
C. 3\\
D. 2