Match List $I$ with List $II$ and select the correct answer using the codes given below the lists:

$1.$ Heavy water	$a.$ Bicarbonates of $Mg$ and $Ca$ in water
$2.$ Temporary hard water	$b.$ No foreign ions in water
$3.$ Soft water	$c.$ $D_2O$
$4.$ Permanent hard water	$d.$ Sulphates and chlorides of $Mg$ and $Ca$ in water

• A
  $1-c, 2-d, 3-b, 4-a$
• B
  $1-b, 2-a, 3-c, 4-d$
• C
  $1-b, 2-d, 3-c, 4-a$
• D
  $1-c, 2-a, 3-b, 4-d$