Answer:
Correct answer is D . grew his empire by taking over many countries.
Step-by-step explanation:
Option A is not correct as Peloponnesian War ended in 404 BC, so this events are not connected.
B is not correct as this two city-states didn't present a great threat for him, especially after the battle of Chaeronea.
C is not correct as he didn't dismantled the city-states. He just incorporated them into his Empire.
D is correct answer as it was the largest empire the world has seen until then, stretching across three continents.