Answer:
b.their over emphasis on the military
Explanation:
The life in Sparta was based on the military. The Spartan society was a militaristic one, the main goal of the city-state was to train its citizens to become a soldier that could fight enemies of revolts.
The Spartan birth rate declined and because of the culture of the military, society was not focused on family, with time there were only a few soldiers to fight its wars, by the time of the Battle of Leuctra Spartan army was small and the city-state was defeated.
