Mark the statements correctly if it correctly identifies or explains methods Genghis Khan used to gain power and enlarge his empire.
A: Used terror as a weapon and an effective war tactic.
B: Gave the inhabitants of cities he attacked the choice of surrendering or dying
C: Put away his soldier's armor and ruled as emperor
D: Used new fighting methods including siege towers, scaling ladders, and catapults
E: Turned his warriors into an army and united the mongols
F: Commanded his soldiers to fight pretend battles to sharpen their skills