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Which risk increases in ancient Chinese cast iron plowshares subjected to acidic soil?

A)Graphitization weakens the iron
B)Oxidation accelerates material loss
C)Ferrite transforms into austenite
D)Cementite precipitation hardens the metal

💡 Explanation

Oxidation from acidic soil leads to rust because electrochemical corrosion occurs at the iron surface; therefore, accelerated material loss by oxidation is the correct risk, rather than altered phase transitions or graphitization that require high temperatures or specific alloy composition.

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