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Explanation:
Option 1 states that the Paris Agreement was signed by all UN member countries and will go into effect in 2017. This is partially incorrect. While the agreement was signed by nearly all member countries, it officially entered into force on November 4, 2016, not 2017.
Option 2 is correct. The central aim of the Paris Agreement is to strengthen the global response to the threat of climate change by keeping a global temperature rise this century well below 2 degrees Celsius above pre-industrial levels and to pursue efforts to limit the temperature increase even further to 1.5 degrees Celsius.
Option 3 is also incorrect. Developed countries did acknowledge their part in global warming and committed to assist developing countries in dealing with climate change, but the committed amount is $100 billion annually by 2020, not $1000 billion.
So, the correct answer is Option 2.