When did early hunter-gatherer societies move to new areas?

When their food, AKA the animals moved or died around the area

D.All of these choices are correct.

Explanation:

Europe lost about 50 million people due to the war, the birth rate and the Spanish fever epidemic from 1914 to 1921. Roads and factories were destroyed and inflation raged in Germany, Austria, Hungary, Italy and Poland. The Balkan countries were particularly affected. As the population in this area was largely agricultural, land reforms were carried out and so many peasants acquired private estates.