For The process of electrolysis, which acid-base focus answer best supports this Unit 4.4 objective: Identify the negative electrode as the cathode?

The correct option is To allow ions to move freely - correct acid-base focus for electrode.

The correct option is To allow ions to move freely - correct acid-base focus for electrode. To allow ions to move freely - correct acid-base focus for electrode is correct because it directly supports the approved learning objective to identify the negative electrode as the cathode. This acid-base focus variant asks students to separate electrode from similar Unit 4.4 chemical-change ideas. The reasoning belongs to The process of electrolysis within Electrolysis, 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 electrode 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.