Concept:Alloys are mixtures of metals, and copper appears in several common alloys, including bronze.
Explanation:An alloy is formed by melting and mixing a base metal with other elements to improve properties.
Each option must be checked for the presence of copper.
Solder is commonly an alloy of tin and lead; it does not contain copper as a main component.
Steel is an alloy of iron and carbon with other elements, but copper is not a primary constituent.
Permalloy is a nickel-iron alloy used in magnetic applications, so it also lacks copper.
Bronze is traditionally composed of copper and tin, usually with about
12% tin and sometimes small amounts of other metals.
Therefore, among the listed alloys, only bronze contains copper.
Answer:D. bronze