Final answer:
Advancements to making objects out of bronze included sharper tools, but iron ultimately triumphed in China due to its advantages of being cheaper, tougher, and more common in the earth.
Step-by-step explanation:
In the ancient world, advancements in making objects out of bronze included sharper tools and the ability to create weapons and armor. However, iron ultimately triumphed in China. Iron was cheaper, tougher, and more common in the earth compared to bronze. It meant higher productivity and the ability to arm more soldiers, which contributed to its triumph over bronze in China.