Brass and bronze are alloys primarily made from which metal?

Brass and bronze are indeed primarily made from copper, making it the correct choice for this question.

Brass is an alloy that typically consists of copper and zinc, with the copper providing strength and corrosion resistance. The addition of zinc enhances its mechanical properties and allows for a variety of finishes. Bronze, on the other hand, is an alloy primarily composed of copper and tin, with other elements sometimes included to improve certain characteristics, such as strength or resistance to corrosion.

Both brass and bronze are valued for their favorable properties, which include excellent machinability, resistance to tarnish, and aesthetic appeal. Consequently, the presence of copper in these alloys is essential for their unique qualities, distinguishing them from other metals such as iron, aluminum, or gold, which are not the primary components in these specific alloys.