Following are the different steps carried out in a waste water treatment plant. These steps are arranged in a random fashion. Select the option that arranges these steps in the correct sequence.
(i) Wastewater is passed into sedimentation tank.
(ii) Sludge is decomposed by anaerobic bacteria.
(iii) Wastewater is passed through bar screens.
(iv) Wastewater is passed to grit and sand removal tank.
(v) Solids settle at the bottom and floatable materials
are removed by skimmer.
(vi) Aeration of water takes place.
(vii) Disinfection of water by adding chlorine.
A(iii) → (i) → (iv) → (v) → (ii) → (vi) → (vii)
B(iii) → (iv) → (i) → (v) → (ii) → (vi) → (vii)
C(iv) → (vi) → (v) → (iii) → (ii) → (i) → (vii)
D(iv) → (v) → (vii) → (ii) → (vi) → (i) → (iii)