SO₂ as pollutant can be controlled by
(I) using solar energy, nuclear energy, hydroelectric energy.
(II) low sulphur fuels, natural gas.
(III) desulphonation of high-sulphur coal and oil before burning by FGD.
(IV) using water under high pressure.
Correct methods are

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Both I and II

Both I and III

I, II and IV

I, Il and III

answer is D.

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Detailed Solution

SO₂ in the atmosphere is due to burning of sulphur containing
fossil fuel, $S + O_{2} \overset{}{\to} {SO}_{2}$ and
from smelting and roasting of sulphides.

${CuFeS}_{2} + O_{2} \overset{}{\to} {Cu}_{2} O + FeO + {SO}_{2}$

SO₂ content can be controlled by using alternate source of energy for burning, as nuclear energy, solar energy, hydroelectric energy.
Fuels containing sulphur are desulphonated before burning by FGD (Fuel Gas Desulphurisation).
If H₂O under high pressure is used, it will dissolve SO₂ and will make acid rain.
$H_{2} O + {SO}_{2} \overset{}{\to} H_{2} {SO}_{3}$
It will lower pH of the soil and thus fertility is decreased.