Match Column $- I$ with Column $- II.$

Column $- I$	Column $- II$
$(a)$ Nitrococcus	$(i)$ Denitrification
$(b)$ Rhizobium	$(ii)$ Conversion of ammonia to nitrite
$(c)$ Thiobacillus	$(iii)$ Conversion of nitrite to nitrate
$(d)$ Nitrobacter	$(iv)$ Conversion of atmospheric nitrogen to ammonia

Choose the correct answer from the options given below.

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