What do you think would have prevented this undesirable change?

Polishing

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Applying grease

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Cleaning

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Painting

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Solution

The correct option is D Painting
Applying paint on the iron surface forms a protective layer and prevents rusting by not allowing the metal surface to come in direct contact with air and moisture. Although applying grease is a method to prevent rusting, applying grease on large surfaces is not quite effective.

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