The model suggests that living humans came from the species homo erectus and that their development took place throughout the world.
1.assimilation
2.out-of-africa
3.multiregional continuity

The correct answer is option 3. "Multiregional Continuity".

Explanation:

The Multiregional Continuity Model explains the evolution of humanity by the migration of the ancestor Homo erectus from Africa to other parts of the Old World. This model explains that the differences in environmental conditions and natural selection among the regional habitats resulted in the development of the different races of humans, however there was some level of gene flow trough geographically separated places that prevented the speciation of the Homo erectus.

i would go with the last one

the soviet union wanted to impose communist governments in eastern europe.