After the conventional sedimentation, filtering and chlorine, lots of dangerous pollutants still remain. To combat this, the biologists developed a series of six connected marshes where appropriate plants, algae, fungi and bacteria were seeded into this area, which
(i) neutralise the pollutants
(ii) absorb the pollutants
(iii) assimilate the pollutants

• A

  (i), (ii) and (iii)

• B

  only (iii)

• C

  only (i) and (iii)

• D

  only (i) and (ii)