GKFix MCQ Question

What is the correct equation for the reaction between cobalt and nickel ions?

• A. Co²⁺(aq) + Ni(s) → Co(s) + Ni²⁺(aq)
• B. Co(s) + Ni(s) → Co²⁺(aq) + Ni²⁺(aq)
• C. Co²⁺(aq) + Ni²⁺(aq) → Co(s) + Ni(s)
• D. Co(s) + Ni²⁺(aq) → Co²⁺(aq) + Ni(s)