Match the column $A$ (type of crystalline solid) with the column $B$ (example for each type).

$P$. Molecular solid	$i$. $SiC$
$Q$. Ionic solid	$ii$. $Mg$
$R$. Metallic solid	$iii$. $H_2O$
$S$. Network solid	$iv$. $MgO$

• A
  $P-iii, Q-i, R-ii, S-iv$
• B
  $P-iv, Q-iii, R-ii, S-i$
• C
  $P-ii, Q-iv, R-iii, S-i$
• D
  $P-iii, Q-iv, R-ii, S-i$