Solid magnesium reacts with aqueous copper(I) sulfate to form aqueous magnesium sulfate and solid copper. Express your answer as a chemical equation including phases.
a) Mg + CuSO₄ → MgSO₄ + Cu
b) MgSO₄ + Cu → Mg + CuSO₄
c) Mg + CuSO₄ → Cu + MgSO₄
d) CuSO₄ + Mg → Cu + MgSO₄