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The United Nations Framework Convention on Climate Change (UNFCCC) is an international treaty that was drawn up at the UN Conference on Environment and Development (UNCED), held in Rio de Janeiro, Brazil, in 1992. The conference is also known as the Earth Summit, and it brought together world leaders, government officials, and representatives from non-governmental organizations to discuss issues related to sustainable development and the environment.
The UNFCCC was one of the key outcomes of the Earth Summit, and it is a legally binding treaty that commits signatory countries to take action to address climate change. The treaty has been ratified by almost all countries in the world, including the United States, China, India, and the European Union.
Therefore, the correct answer is (b) UN Conference on Environment and Development, Rio de Janeiro, 1992.