Which statement is correct regarding greenhouse gases? I. A greenhouse gas (GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range II. Water vapour contributes to 36-72% of Greenhouse effect III. Nitrous Oxide contributes to about 10% of Greenhouse effect IV. Ozone contributes to 3-7% of Greenhouse effect

• A.  I & II                           
• B.  I, II & III
• C.  I, II & IV                     
• D.  All the above