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A bug appears around nested data. What is the strongest first debugging move?

Multiple choiceMediumchapter-3-curatedpremiumcore-collectionsnested-data
python
order = {
    "id": "ORD-12",
    "lines": [{"sku": "SKU-1", "qty": 2}, {"sku": "SKU-2", "qty": 1}],
}
print(order["lines"][0]["sku"])
Choose one answer
Answer and explanation

Correct answer

C. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. Jumping through nested dictionaries in one line hides missing-key risks and makes bugs harder to pinpoint.

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