A student researching metallurgy has taken notes:
• Bronze Age began when humans learned to alloy copper and tin • Bronze was harder than pure copper • Iron eventually replaced bronze for tools and weapons • Steel is iron alloyed with carbon • Modern alloys combine many elements for specific properties
The student wants to explain the importance of alloys in human history.
Steel is created by alloying iron with carbon.
Alloys transformed human history—from bronze replacing pure copper to launch a new era, to modern alloys engineered for specific properties.
Iron eventually replaced bronze for making tools and weapons.
Modern alloys combine many elements to achieve specific properties.
Correct Answer: B
Choice B. Bronze Age transformation to modern engineering shows alloys' historical importance.