$A-$ In nature,lightning and ultraviolet radiation provide enough energy to convert nitrogen to nitrogen oxides.
$R-$ Industrial combustion,forest fires,automobile exhausts,and power-generating stations are also sources of atmospheric nitrogen oxides.

  • A
    $A$ and $R$ both are correct.
  • B
    $A$ and $R$ both are incorrect.
  • C
    $A$ is correct and $R$ is incorrect.
  • D
    $A$ is incorrect and $R$ is correct.

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