Answer:
Water is needed for iron to rust.....
Explanation:
As you can see the liquid in tube A is water liquid in tube B is a drying agent and the liquid in Tube C is Boiled water with oil above .
The only change was in Tube A, a red-brown deposit which is rust.
And Tube B and C didn't have any change.
Which results that only water can change iron to rust.
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