Answer :
Substances that can rust or decompose are considered as corrosive.
How rusting takes place?
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust
A corrosive substance is one that will damage or destroy other substances with which it comes into contact by means of a chemical reaction. it will cause rusting on iron substances.
Hence, the correct option is 'B'.
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