In an experiment to study the conditions for rusting, three test tubes are set up: Tube A: Iron nail in tap water and air. Tube B: Iron nail in boiled distilled water covered with a layer of oil. Tube C: Iron nail in dry air with anhydrous calcium chloride. In which of the tubes will rusting occur, and what does this demonstrate?

Options:

• A: In Tubes A and B; demonstrating that only water is essential for rusting.
• B: In Tubes A and C; demonstrating that only oxygen is essential for rusting.
• C: Only in Tube A; demonstrating that both oxygen and moisture are essential for rusting.
• D: In all three tubes; demonstrating that rusting is independent of external atmospheric conditions.

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