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Structure of metals and alloys

AP.Chem: SAP‑3 (EU), SAP‑3.D (LO), SAP‑3.D.2 (EK), SAP‑3.D.3 (EK)
You might need: Periodic table

Problem

Copper-nickel alloys are highly durable, resistant to corrosion, and easily stamped, making them a popular choice for coinage around the world. In the United States, nickels, or five-cent coins, are made out of a copper-nickel alloy composed of approximately 75 mole percent copper and 25 mole percent nickel.
Which of the following diagrams best depicts the structure of the copper-nickel alloy described above?
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