The correct option is Explain why the function returns None when given a string input and include what you expect to happen.

This approach gives Copilot Chat concrete context and a clear goal. By stating the exact input, the observed behavior, and the expected outcome, you enable the assistant to reason about the control flow and types, to infer likely causes of the None result, and to propose targeted fixes and tests. Clear expectations also help Copilot validate its suggestions against the behavior you want.

Ask Copilot to fix this function is too vague because it provides no input example, no description of the current behavior, and no target outcome, which leads to generic or irrelevant changes rather than a focused diagnosis.

Ask for a rewrite in Java diverts from investigating the Python bug and changes the problem entirely, so it does not address why the existing function misbehaves or how to correct it in place.

Ask Copilot to make the code better is subjective and undefined, so it lacks measurable goals and practical constraints, which reduces the chance of receiving precise and actionable guidance for the failure you are seeing.

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