In the diagram, point N is on the inside of the cylinder, 10 cm from the bottom and Point M is on the outside of the cylinder, diametrically opposite Point N 4 cm from the bottom. An ant walks from point M to point N, using the shortest 12 cm possible route. The cylinder has height 12 cm and circumference 15 cm. When the ant got to the top of the cylinder, how many centimetres did it still have to walk? Ignore the thickness of the cylinder wall.
Multiple Choice Options
A) 3 B) 2 C) 2.25 D) 2.5 E) 2.75