C - 1, D - 3.Continental island is a special type of island which is CREATED when a continent is rifted.Madagascar, Socotra, New Caledonia, New Zealand, and some examples of the continental island.Coral islands are landforms formed entirely of sediments mostly calcium carbonate produced by organisms such as corals, molluscs and GASTROPODS that live on coral reefs in the surrounding waters.The Maldives is an EXAMPLE of it.Volcanic island are LARGE volcanoes erupted on the seafloor and the tops of them have emerged above sea level Volcanic islands occur in ocean basins or near ocean ridges.Examples- Mauritius, Aleutian Islands, the Mariana Islands, and most of Tonga islands.Andaman and Nicobar islands are an example of mountain islands.