While WWI was fought in the trenches and used machine guns and poisonous gas, WWII was fought using modern artillery and machines utilizing more airplanes, ships, tanks, and submarines. Special operations methods were also developed during this war together with atomic missiles and secret communications.
One result of the crusades was
B. The Europeans discovered many new goods
This is because of their exposure to middle-eastern culture
They pursued Tobacco, Horses, Farming primarily. There were also blacksmiths, clothiers, and builders/loggers.