Concept:The Universal Postal Union (UPU) is a specialized agency of the United Nations, and its headquarters is located in Bern, Switzerland.
Explanation:India was elected to the Council of Administration (CA) and Postal Operations Council (POC) of the UPU during the 27th UPU Congress in Abidjan, Côte d'Ivoire.
The UPU was founded on 9 October 1874 at Bern, Switzerland.
Its headquarters has remained in Bern, Switzerland since its establishment.
Hence, among the given options, Bern, Switzerland is the correct location of the UPU headquarters.
Answer:C. Bern, Switzerland