At the end of World War III, the country of Puzzandia has lost many of their planes due to lack of armor. As Puzzandia's plane maker, it is your duty to put armor on the planes. Each plane has been divided into 4 sections; The engine, the fuel tanks, the wings, and the rest of the plane. The only problem is, Puzzandia has only provided you with enough armor to cover 1 section. You are given statistics from the planes that have came back:
Section Bullet Holes per square foot Engine 1.12 Fuel Tanks 1.43 Wings 1.89 Other 1.56
Which section of the Plane should you put the armor on, and why?