How did Alexander the Great establish the world's largest empire at the time? A. He defended Greece against Persian invaders and spread democracy into the Persian Empire
.B. He won fame as a military leader, and he respected the traditions of the people he conquere
.C. He created important trade routes to the Persian Empire and won control of his empire without having to fight any wars.
D. He was elected as the ruler of Athens and led his army to victory against the city-state of Sparta.