Before 600 C.E., large centralized empires, such as the Han, Persian, and Roman empires, extended their military power by
A giving more political power to the common people in the conquered territories, thus eliminating the need for large armies of occupation
B developing supply lines and building infrastructure, including defensive walls and roads
C creating open societies inclusive of different religious and cultural practices, thus decreasing the chance of revolts
D recruiting their armies entirely from inhabitants of their core territories and excluding members of newly conquered lands
Answer: B