Answer:

B.Rusting

Explanation:

Rust forms on the surface of an iron or steel object, when that surface comes into contact with oxygen. The oxygen molecules collide with the iron atoms on the surface of the object, and they react to form iron oxide.

___is caused by the reaction of iron with oxygen present in the air

a.combustion

b.rusting

c moisture

d.burning

Explanation:

Oxygen causes the iron to rust.