Final answer:
The Shang kings used the feudal system to defend their kingdom and govern local territories.
Step-by-step explanation:
The subject of this question is History. The question is asking about the system used by the Shang kings to defend their kingdom and govern local territories. The correct answer is B) Feudal System. The feudal system meant that the king would share his authority with local lords who would govern their own territories, while still owing the king tribute and military support. This system allowed for a decentralized rule with the king at the top.