Explanation:

The correct order is Assumption- Agalega-Seychelles-Diego Garcia

Recently, Seychelles President Danny Faure, in the first-ever live speech from an underwater submersible, has made a global plea for stronger protection of the oceans. He gave his speech from a submersible craft that had dived to 406 feet off Desroches Island in the Seychelles, part of a series of scientific missions to explore and protect the Indian Ocean. The series of scientific expeditions, called First Descent, was organized by Nekton, a nonprofit research institute, in collaboration with the University of Oxford. His call for action, the first-ever live speech from an underwater submersible, comes from one of the many island nations threatened by global warming. The Seychelles along with other small island nations are among the most vulnerable to rising sea levels caused by climate change. Land erosion, dying coral reefs and the increased frequency of extreme weather events threaten their existence