Make the correct pairs from below mentioned $X$ and $Y$:

$X$	$Y$
$1$. Extraction of sulphur	$p$. Contact process
$2$. Production of nitric acid	$q$. Frasch method
$3$. Production of sulphuric acid	$r$. Haber's process
$4$. Production of ammonia gas	$s$. Ostwald's method

• A
  $(1-q), (2-p), (3-r), (4-s)$
• B
  $(1-q), (2-s), (3-p), (4-r)$
• C
  $(1-s), (2-p), (3-q), (4-r)$
• D
  $(1-s), (2-r), (3-p), (4-q)$