Read the given passage and fill in the blanks by choosing an appropriate option. Iron nails when new are grey and bright. When exposed to ___(i)___, they get covered with a ___(ii)___ coating. This process is called ___(iii)___ and it is a ___(iv)___ change.

• A. (i)(ii)(iii)(iv)Moist airGreyCorrosionChemical, reversible      
• B. (i)(ii)(iii)(iv)Air and waterReddish brownRustingChemical, irreversible      
• C. (i)(ii)(iii)(iv)Oxygen in airGreenRancidityPhysical, irreversible      
• D. (i)(ii)(iii)(iv)Nitrogen in airReddish brownGalvanisationChemical, irreversible