Step 1: Identify alloy and element definitions.
An element comprises a single type of atom (e.g., Copper, Zinc, Gold). An alloy combines two or more elements, with at least one metal.
Step 2: Categorize provided options.
Copper, Zinc, and Gold represent pure metallic elements from the periodic table. Brass, however, is an alloy—specifically, a Copper and Zinc combination.