Secretariat of convention on Biodiversity (CBD) is situated in

Correct option is D

The Secretariat of the Convention on Biodiversity (CBD) is situated in Montreal, Canada. The CBD is an international treaty established to address issues related to biodiversity conservation and sustainable use of biological resources. It was adopted at the Earth Summit in Rio de Janeiro in 1992 and entered into force in 1993.
The CBD Secretariat is responsible for facilitating the implementation of the Convention and acts as the administrative hub for various activities related to biodiversity conservation.