The greatest advantage the United States enjoyed on the ground in the fighting was . . . the jeep and the two-and-a-half ton truck. These are the instruments that moved and supplied United States troops in battle, while the German army . . . depended on animal transport. . . . The United States, profiting from the mass production achievements of its automotive industry . . . had mobility that completely outclassed the enemy." —General George Marshall What does this passage tell us about the way World War II was won?
A. Having superior equipment intimidated the enemy.
B. Moving troops and supplies quickly was critical.
C. Ground troops had the most difficult job.
D. Without jeeps and trucks, soldiers had to walk.