Diagnose Why I Got This Question Wrong

Help me understand why I got this question wrong. I will give you: - the question; - my answer; - the source material, mark scheme or teacher feedback if I have it. My level: [AGE / YEAR / GRADE / COURSE LEVEL] Subject: [SUBJECT] Analyse the evidence and tell me which of these best explains the problem: - Knowledge gap: I did not know or remember something I needed. - Understanding gap: I knew the information but misunderstood what it meant. - Application gap: I know the idea but did not use it correctly in this question. - Question-reading problem: I misunderstood what the question was asking. - Accuracy problem: I made an avoidable mistake such as missing a keyword, step, unit or piece of working. - Not enough evidence: you cannot reliably tell from what I supplied. Then: 1. Explain the problem in plain language. 2. Show what a stronger thought process would have looked like. 3. Give a corrected answer or marking points where the supplied material supports them. 4. Give me one short follow-up question that targets the same weakness in a different way. 5. Do not give the answer to the follow-up until I attempt it. Do not invent a mark scheme or curriculum rule I have not supplied. If more information would materially change your diagnosis, tell me what is missing. Question: [QUESTION] My answer: [MY ANSWER] Supporting material or feedback: [OPTIONAL: PASTE OR ATTACH]