Match the valves of the human heart in column $I$ with the respective opening they guard in column $II$ and select the correct option.

Column $I$	Column $II$
$i$. Eustachian valve	$a$. Opening of pulmonary aorta
$ii$. Thebesian valve	$b$. Left atrioventricular aperture
$iii$. Mitral valve	$c$. Opening of inferior vena cava
$iv$. Semilunar valve	$d$. Opening of coronary sinus

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