Two global regions which are very closely related are:
a. political and climatic
b. geographical and racial
c. geographical and climatic

I think it's B, if they are geographically around one another and share some racial background they are related. DNA, for example does prove we can be closely related. Genetics and such.

Really hope this helps, tell me if i'm wrong!

5×^2+20-15 or -(5x^2-20+15)

There is no map, maybe give the link, it may be b