The following table presents parts of the electromagnetic spectrum and their corresponding major applications.

Part of the electromagnetic spectrum	Applications
$P$. Microwave	$I$. For purifying the water
$Q$. $UV$ rays	$II$. For warming the food
$R$. Gamma rays	$III$. For $AM$ and $FM$ communication systems
$S$. Radio wave	$IV$. For treating the cancer cells

The correct option is:

• A
  $P-I, Q-II, R-III, S-IV$
• B
  $P-I, Q-IV, R-II, S-III$
• C
  $P-II, Q-I, R-IV, S-III$
• D
  $P-II, Q-IV, R-III, S-I$