The correct option is B Air pollutants released from oil refinery of Mathura
The industries located in and around Agra, like rubber processing, chemicals and especially the Mathura oil refinery, have been responsible for producing pollutants like sulphur dioxide and nitrogen dioxide. These gases react with the water vapour present in the atmosphere to form sulphuric acid and nitric acid. When these acids react with water in the rain, they form acid rain. This acid rain is very corrosive in nature.