Match Column I with Column II

Column I	Column II
(a) Free living aerobic nitrogen fixer	(i) Frankia
(b) Free living anaerobic nitrogen fixer	(ii) Azotobacter
(c) Free living heterocystous cyanobacteria	(iii) Anabaena
(d) Symbiotic nitrogen fixer	(iv) Clostridium

• A

  (a)-(iv), (b)-(ii), (c)-(iii), (d)- (i)

• B

  (a)-(i), (b)-(iv), (c)-(iii), (d)- (iv)

• C

  (a)-(i), (b)-(ii), (c)-(iii), (d)- (iv)

• D

  (a)-(ii), (b)-(iv), (c)-(iii), (d)- (i)