The formation of an atoll is a slow process that can take millions of years. It begins when an underwater volcano erupts, creating a buildup of lava on the seafloor. With continued eruptions, the lava continues to build until it breaks through the ocean's surface and forms an island.
By the change of environment, use sensory organs
The answer is B. Polynesia I hope I'm not too late or if I am I could aide those who need this answer. :)