Match the following columns:

Column-$I$	Column-$II$
$(a)$ Earthworm	$(i)$ Pioneer species
$(b)$ Succession	$(ii)$ Detritivores
$(c)$ Ecosystem service	$(iii)$ Birth rate
$(d)$ Population growth	$(iv)$ Pollination

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