Brass and bronze are alloys of:

Brass and bronze are indeed alloys of copper, which is why this answer is correct.

To elaborate, brass is primarily composed of copper and zinc, while bronze is primarily an alloy of copper and tin, although other elements can also be included to enhance certain properties. The main feature that unites both brass and bronze is the presence of copper, which contributes to their malleability, ductility, and resistance to corrosion.

These properties make copper-based alloys like brass and bronze highly useful in various applications, such as in plumbing, electrical fittings, musical instruments, and decorative items. The versatility provided by copper as a base metal in these alloys is a key reason they are favored in these industries.