Concept:An alloy is a uniform solid mixture of two or more metals, or a metal and another element, prepared by melting and mixing the components together.
Explanation:Electroplating only deposits a thin metal layer on a surface, so it does not produce an alloy.
Arc-welding joins metal pieces by heat, but does not mix them into a new alloy.
Reducing metallic oxides would produce separate metals, not a mixed alloy.
The best method is to melt the constituent metals together, stir the molten mixture thoroughly, and then allow it to cool and solidify.
This process creates a uniform alloy, such as brass formed from copper and zinc.
Therefore, the correct option is the one that describes cooling a molten mixture of the metals.
Answer:D. cooling a molten mixture of the metals