Which statement about alexander the great is true? a. he was the king of sparta who died fighting the persians at thermopylae. b. he founded the olympic games as a way of uniting the greek city-states in peace. c. he was an athenian general who defeated the persian army at the battle of marathon. d. he became king of macedonia at age 20 and built the world's largest empire before he died in babylon 13 years later.