Match the ecological hierarchy given in Column-$I$ with their explanation in Column-$II$. Choose the correct answer from options given below.

Column-$I$	Column-$II$
$a$. Organism	$i$. Flora and fauna of a specific climatic zone.
$b$. Population	$ii$. Populations of different species of an area.
$c$. Community	$iii$. Organisms of same kind inhabiting an area.
$d$. Biome	$iv$. Basic unit of hierarchy.

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