Pollution can be defined as

Options :
  1. presence of unwanted and toxic substances in the environment
  2. removal of upper surface of soil
  3. energy conservation
  4. all the above
Answer and Explanation :-

Answer: Option 1

Explanation:

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The terrible thing, the almost impossible thing, is to hand over your whole self--all your wishes and precautions--to Christ. But it is far easier than what we are all trying to do instead. For what we are trying to do is to remain what we call "ourselves," to keep personal happiness as our great aim in life, and yet at the same time be "good.
-C.S. Lewis Mere Christianity