Montreal protocol was organised in

Options :
  1. 1980
  2. 1988
  3. 1987
  4. 1997
Answer and Explanation :-

Answer: Option 3

Explanation:

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The Book of Wisdom. Simab said: 'I shall sell the Book of Wisdom for a hundred gold pieces, and some people will say that it is cheap.' Yunus Marmar said to him: 'And I shall give away the key to understanding it, and almost none shall take it, even free of charge.
-Idries Shah Thinkers of the East