The correct answer is currency which is letter b. This is the first development of Aksumites without having any pressure from the outside culture as their currency was coinage produced and were used to their Kingdom which held a great significance.
B, horse archers, is correct. The Mongols were able to develop saddles to stay put on their horses while they fought, allowing for more balance while attacking. This made it so they could shoot others while they rode.
Answer:
It's a policy of extending a country's power and influence through diplomacy or military force.
