The correct answer is: A. Copper and zinc.
Brass is an alloy of copper and zinc. It is a mixture of these two metals, and the proportions of copper and zinc can vary to create different types of brass. Brass is a strong, durable metal that is often used in plumbing, hardware, and musical instruments.
Zinc is a metal that is often used in alloys because it is strong and corrosion-resistant. Copper is a metal that is often used in alloys because it is ductile and has a high electrical conductivity.
Brass is a versatile metal that can be used in a variety of applications. It is a good choice for applications where strength, durability, and corrosion resistance are important.
Here is a brief explanation of each option:
- Option A: Copper and zinc. This is the correct answer. Brass is an alloy of copper and zinc.
- Option B: Zinc and lead. This is not the correct answer. Brass is not an alloy of zinc and lead.
- Option C: Tin and silver. This is not the correct answer. Brass is not an alloy of tin and silver.
- Option D: Zinc and nickel. This is not the correct answer. Brass is not an alloy of zinc and nickel.