সঠিক উত্তর হচ্ছে: ভিয়েনা কনভেনশন
ব্যাখ্যা:
The Vienna Convention was adopted by the Conference on the Protection of the Ozone Layer and opened for signature at Vienna from 22 March 1985 to 21 September 1985, and at the United Nations Headquarters in New York from 22 September 1985 until 21 March 1986.
Source: un.org
খেয়াল করুন,
Montreal Protocol is on \'\'Substances that Deplete the Ozone Layer\'\' and
Vienna Convention for \'\'the Protection of the Ozone Layer\'\'
