I just took the quiz the answer is C). Hope this helps!!
This question is incomplete what exactly are you asking?
A thing that wouldn't be necessary condition for the growth of an empire would be internal revolutions and revolts - D.
This option, compared to the others, actually underminens the possibility of success within one empire after some time as undermining authority and creating revolutions doesn't help when creating an empire.
African parts.life began in Africa then distributed to the other parts of the world