The model suggests that living humans came from the species homo erectus and that their development took place throughout the world.
a. assimilation
b. out of africa
c. multiregional continuity

The out of Africa model/hypothesis/theory is a theory shich states that th eliving humans today in modern soceity came from a species that has now been extinct but is commonly refered to as homo erectus and that our development as a species has largely been due to out migration out of Africa around the world.

Your answer, therefore, is - B. 

Interpreting the results of his experiment : )