An alloy is defined as what?

• A. A substance composed of two or more nonmetals.
• B. A substance composed of three or more metals.
• C. A substance composed of two metals.
• D. A solid used for structural framing.

Answer: (C)

A material formed by combining two metals is what an alloy is in this context. When two metals are merged, the resulting substance typically has properties different from its constituent metals, such as greater strength or improved hardness. That’s why brass (copper and zinc) and bronze (copper and tin) are classic examples—two metals blended to create something with desirable qualities.

This makes the best choice because it matches the definition the course uses for an alloy. The other options describe nonmetals, or specify more metals than the standard two-metal case, or describe a use rather than the composition.