Match List I with List II.

Choose the correct answer from the options given below

We need to match the water pollutants/chemicals in List-I with their effects in List-II.

Excess sulphate in drinking water causes a laxative effect (diarrhoea); therefore, A - Sulphate → (III) Laxative effect.

Excess fluoride in water causes fluorosis, resulting in bending of bones and mottling of teeth; hence, B - Fluoride → (II) Bending of bones.

Nicotine has historically been used as a pesticide (insecticide) to kill insects in agriculture, so C - Nicotine → (I) Pesticide.

Sodium arsenite functions as a herbicide (weed killer), giving D - Sodium arsenite → (IV) Herbicide.

This leads to the matching A - III, B - II, C - I, and D - IV, corresponding to Option B.