What Does the Migration of Early Hominins Such as Homo

What does the migration of early hominins such as Homo ergaster and Homo erectus throughout Afroeurasia tell us about these species?

A) They were unable to form sustainable communities, and individuals traveled far afield to hunt alone for food.
B) A great ecological disaster forced these early hominins to find new homes.
C) They were able to adapt to a variety of environmental conditions and likely possessed greater intelligence than earlier hominins.
D) They were unable to cope with the threats of other species and left to seek out safer lands.