Choose the incorrect sentence.

• A
  $UV$ rays are highly injurious to living organisms since $DNA$ and proteins of living organisms preferentially absorb $UV$ rays and their high energy breaks the chemical bonds within these molecules.
• B
  In the stratosphere,$UV$ rays act on $CFCs$ releasing $Cl$ atoms.
• C
  $UV-B$ damages $DNA$ and mutations may occur.
• D
  In the human eye,the cornea absorbs $UV-B$ radiation,and a high dose of $UV-B$ causes inflammation of the cornea,known as snow-blindness.