Which metal is hard, brittle, and very corrosion resistant, consisting of copper and tin, used for statues, coins, bearings, and underwater fittings?

• A. Bronze
• B. Brass
• C. Copper
• D. Titanium

Answer: (A)

Bronze is a copper-tin alloy. Adding tin makes the metal harder and more wear-resistant than pure copper, while also improving its corrosion resistance, including in seawater. Those traits explain why bronze is used for statues (it can capture fine details and hold up over time), coins (durable and tarnish-resistant), bearings (wear resistance for moving parts), and underwater fittings (resists corrosion in marine environments). The other materials don’t fit: brass (copper-zinc) is softer and less corrosion-resistant; copper alone is too soft for durable bearings and fittings; titanium, though corrosion-resistant, isn’t the copper-tin alloy described and isn’t typical for coins or classic statues. Bronze best matches all the listed uses.