Secretariate of Convention on Biodiversity (CBD) is situated in

The correct option is Montreal, Canada.

The Secretariat of the Convention on Biological Diversity (CBD) is the administrative body responsible for organizing meetings, drafting documents, and assisting member governments in implementing the treaty's goals. The CBD itself is a landmark multilateral treaty focused on the conservation of biological diversity, the sustainable use of its components, and the fair and equitable sharing of benefits arising from genetic resources.

Key historical and administrative facts regarding the secretariat include:
1. Relocation: The Secretariat was initially established in Geneva, Switzerland, in 1993. However, it was permanently relocated to Montreal, Canada, in 1996.
2. Administration: The Secretariat operates under the administration of the United Nations Environment Programme (UNEP).
3. Functions: It coordinates global efforts, facilitates negotiations among member nations (Parties), and hosts major conferences, such as the Conferences of the Parties (COP), to establish international biodiversity frameworks.