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A bug appears around function extraction. What is the strongest first debugging move?

Multiple choiceMediumchapter-2-curatedpremiumfunctionsfunction-extraction
python
def calculate_subtotal(unit_price: float, quantity: int) -> float:
    return unit_price * quantity


def shipping_fee(subtotal: float) -> float:
    return 0 if subtotal >= 100 else 6.50
Choose one answer
Answer and explanation

Correct answer

A. 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. Copy-pasted logic or giant helper functions usually mean the code has not decided where one responsibility ends.

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