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Which of the following are the main sources of indoor air pollution?

 

  1. Excess moisture
  2. New carpets
  3. Outdoor pollution
  4. Pesticide

Select the correct answer from the codes given below-

[A] 1,2,3,4
[B] 3 and 4 only
[C] 1,2 and 4 only
[D] 2,3 and 4 only

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