Brass correct option D
: Brass consists 68–71% Copper and rest is Zinc. Bronze consists 88% Copper and 12% Tin. German silver has almost 50% Copper.

Answer:

Introduction:
Alloys are a mixture of two or more metals. They are created to enhance the properties of metals. For example, alloys are used to make the metal more durable, resistant to corrosion, and harder.

Alloys and their Composition:

There are four major types of alloys, brass, bronze, gunmetal, and German silver. They have different compositions and properties. The percentage of copper in each alloy is different.

Brass:

Brass is an alloy of copper and zinc. It is a popular alloy because it is easy to work with. Brass is widely used in many applications because of its attractive appearance. The percentage of copper in brass varies from 60% to 90%. The percentage of zinc in brass varies from 10% to 40%. The highest percentage of copper in brass is 90%.

Bronze:

Bronze is an alloy of copper and tin. It is known for its strength and durability. Bronze is used in the manufacturing of statues, bells, and musical instruments. The percentage of copper in bronze varies from 60% to 90%. The percentage of tin in bronze varies from 10% to 40%. The highest percentage of copper in bronze is 90%.

Gunmetal:

Gunmetal is an alloy of copper, tin, and zinc. It is known for its strength and durability. Gunmetal is used in the manufacturing of weapons, gears, and bearings. The percentage of copper in gunmetal varies from 80% to 90%. The percentage of tin in gunmetal varies from 3% to 10%. The percentage of zinc in gunmetal varies from 7% to 10%. The highest percentage of copper in gunmetal is 90%.

German Silver:

German silver is an alloy of copper, nickel, and zinc. It is known for its silver-like appearance. German silver is used in the manufacturing of cutlery, jewelry, and musical instruments. The percentage of copper in German silver varies from 50% to 70%. The percentage of nickel in German silver varies from 10% to 30%. The percentage of zinc in German silver varies from 10% to 30%. The highest percentage of copper in German silver is 70%.

Conclusion:

Among the four alloys, Gunmetal contains the highest percentage of copper which is 80% to 90%. Therefore, option (a) Gunmetal is the correct answer.