Question

Modes of controlling pollution in large cities include(s):

• A. less use of insecticides.
• B. proper disposal of organic wastes, sewage and industrial effluents.
• C. shifting of factories out of the residential area.
• D. all the above

Answer 1

The correct option is D all the above

In large cities, environmental health can be maintained by decreased use of insecticides as it affects air quality. All types of household and industrial waste should be handled and disposed of out of the city area and factories inside the residential areas cause great harm to health by polluting the air and water with its wastes, so they must be shifted outside the residential area.

Hence, the correct option is $\text{D}$.