Which goal was Philip II unable to accomplish?

A) modernizing the army

B) establishing a dictatorship

C) unifying the Greek city-states

D) conquering the Persian Empire

D) conquering the Persian Empire

Explanation:

- modernizing the army

He modernized the army by using the invention of Epaminondas' and Iphicrates' to create longer spears and smaller shields that were more efficient in the battle.

- establishing a dictatorship

Phillip Ii believed in Divine Rights of monarch which basically require all citizens to obey the King without question. It's similar to dictatorship.

- unifying the Greek city-state

In 338 BC, He managed to unified Greek city-states and put them under one federation called the League of Corinth

- conquering the Persian Empire

He did plan to do this after the Greek unification. But he was assassinated before he could accomplished it.