Recent reports of acid rain in industrial cities are due to the effect of atmospheric pollution by

• A
  Excessive release of $NO_2$ and $SO_2$ by burning of fossil fuels
• B
  Excessive release of $CO_2$ by burning of fuel like wood and charcoal,cutting of forests and increased animal population
• C
  Excessive release of $NH_3$ by industrial plants and coal gas
• D
  Excessive release of $CO$ in atmosphere by incomplete combustion of coke,charcoal and other carbonaceous fuels in paucity of oxygen