Biogas can be a good substitute for

Options :
  1. charcoal
  2. coal
  3. petroleum and oil
  4. none of these

Answer and Explanation :-

Answer: Option 3


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I thought: hope cannot be said to exist, nor can it be said not to exist. It is just like roads across the earth. For actually the earth had no roads to begin with, but when many men pass one way, a road is made.
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