Match List-$I$ with List-$II$:

List-$I$	List-$II$
$a$. $Be$	$i$. Treatment of cancer
$b$. $Mg$	$ii$. Extraction of metals
$c$. $Ca$	$iii$. Incendiary bombs and signals
$d$. $Ra$	$iv$. Windows of $X$-ray tubes
	$v$. Bearings for motor engines

Choose the most appropriate answer from the options given below:

• A
  $a-iv, b-iii, c-ii, d-i$
• B
  $a-iv, b-iii, c-ii, d-v$
• C
  $a-iii, b-iv, c-ii, d-i$
• D
  $a-iv, b-ii, c-iii, d-i$