Answer:
B: They mostly occurred in areas with mild climates.
Explanation:
Due to the mild climates if the water was available, and the soil was fertile, they found a place where they can stay and live.
 
        
             
        
        
        
Like democratic republic etc
        
             
        
        
        
Darius I improved the Persian government by dividing the Persian Empire into provinces and implementing numerous construction projects. Theses projects included the construction of a new capital at Persepolis and roads throughout the empire.
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Spain and Portugal divided the New World by drawing a north-to-south line of demarcation in the Atlantic Ocean, about 100 leagues (555 kilometers or 345 miles) west of the Cape Verde Islands, off the coast of northwestern Africa and then controlled by Portugal.