Answer:
I believe that the answer is probably going to B.)The growth of urban areas centralizes regional populations.
Step-by-step explanation:
I think because 'c' and 'e' are somewhat saying the same thing about how they will be similar, or less diverse (which to me makes no sense since there would probably be more diversity within the population. I don't really know what 'a' has to do with anything, but I haven't taken a geography class in a while.
Hope this helps! Sorry if I am wrong. ;-;