For The reactivity series, which ion focus answer best supports this Unit 4.4 objective: Write balanced symbol equations for metal displacement reactions when formulae are supplied?

The correct option is Zn + CuSO4 → ZnSO4 + Cu - correct ion focus for displacement.

The correct option is Zn + CuSO4 → ZnSO4 + Cu - correct ion focus for displacement. Zn + CuSO4 → ZnSO4 + Cu - correct ion focus for displacement is correct because it directly supports the approved learning objective to write balanced symbol equations for metal displacement reactions when formulae are supplied. This ion focus variant asks students to separate displacement from similar Unit 4.4 chemical-change ideas. The reasoning belongs to The reactivity series within Reactivity of metals, so it should not be confused with nearby ideas about acids, alkalis, bases, oxidation, reduction, displacement, reactivity, electrolysis, electrodes, ions, pH, or salt preparation unless those are named in the objective. Use the focus term displacement to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.4 Chemical changes. Keep acid, alkali and base distinct; keep oxidation and reduction distinct; do not mix reduction with displacement; keep electrolysis separate from electroplating; distinguish anode from cathode, positive ions from negative ions, oxidation state from ionic charge, and strong acid from concentrated acid. The other options are weaker because they either use the wrong reaction type, wrong ion, wrong electrode, wrong acid-base distinction, vague wording, or the wrong chemical-change context.