"Momentum for Change: Climate Neutral Now" is an initiative launched by

The answer is C, the UNFCCC Secretariat. Momentum for Change is the UNFCCC's flagship platform for recognising innovative climate action by non-state actors such as cities, businesses and communities. Climate Neutral Now is its companion initiative, which invites organisations to measure their emissions, reduce them, offset the rest and publicly report progress under the Convention's framework.

Why the others are wrong:

• A (IPCC): It is a scientific assessment body that produces reports for governments. It does not run campaigns or registries.
• B (UNEP Secretariat): UNEP runs its own environmental programmes. It is not the secretariat that administers the Convention's climate initiatives.
• D (WMO): It is a specialised agency for weather and climate science and observation. It does not launch climate-action campaigns.

The core concept is the role of the UNFCCC, which operates under the 1992 Convention and supports the Paris Agreement. For Mains, this links to how non-state actors and climate finance complement state commitments.

Trap: Candidates pick IPCC or UNEP because they sound like climate bodies. Ask which institution administers the Convention's outreach, not which body produces science or environmental programmes.