The correct answer is option 'B', which states that the United Nations Framework Convention on Climate Change (UNFCCC) was drawn at the UN Conference on Environment and Development, also known as the Earth Summit, held in Rio de Janeiro in 1992. Let's delve into the details to understand why this is the correct answer.

1. The United Nations Conference on the Human Environment, Stockholm, 1972:
- The United Nations Conference on the Human Environment was indeed a significant event in the history of environmental governance.
- However, it focused on discussing and addressing various environmental issues and creating a platform for global environmental cooperation.
- The conference led to the establishment of the United Nations Environment Programme (UNEP), but it did not result in the creation of the UNFCCC.

2. The World Summit on Sustainable Development, Johannesburg, 2002:
- The World Summit on Sustainable Development was a follow-up event to the Earth Summit held in Rio de Janeiro in 1992.
- The summit aimed to reinvigorate global commitments to sustainable development and address pressing environmental and developmental challenges.
- While the summit emphasized the importance of addressing climate change, it did not directly result in the creation of the UNFCCC.

3. The UN Climate Change Conference, Copenhagen 2009:
- The UN Climate Change Conference held in Copenhagen in 2009 was a critical event in international climate negotiations.
- The conference aimed to reach a global agreement on climate change mitigation and adaptation measures.
- However, the UNFCCC was already established prior to this conference, making it an incorrect option.

4. The UN Conference on Environment and Development, Rio de Janeiro, 1992:
- The UN Conference on Environment and Development, also known as the Earth Summit, was a landmark event in the field of sustainable development.
- The conference brought together world leaders, policymakers, and stakeholders to discuss pressing environmental and developmental issues.
- The UNFCCC was one of the key outcomes of this conference, reflecting the global commitment to address climate change collectively.
- The convention entered into force in 1994 and serves as the primary international framework for addressing climate change, promoting cooperation, and coordinating global efforts.

In conclusion, the correct answer is option 'B', as the UNFCCC was drawn at the UN Conference on Environment and Development, Rio de Janeiro, in 1992. This conference played a pivotal role in shaping global environmental governance and resulted in the establishment of the UNFCCC as a framework for addressing climate change.