The correct option is A The Montreal Protocol
The United Nations Framework Convention on Climate Change (UNFCCC), formed in 1992, commits all the countries around the world to the cause of global warming and its impact. The Kyoto Protocol is an international treaty which extends the UNFCCC, and commits State Parties to reduce greenhouse gas emissions. The Kyoto Protocol was adopted in Kyoto, Japan, on 11 December 1997 and entered into force on 16 February 2005. Till date, 192 countries have approved and adopted this.