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FandomFury
Atolls are the only one here that has anything to do with coral. Playas are basically dried up lakes, artesians are like natural wells, and escarpments are the separation between different geographic elements of different heights.

Answer:

The correct answer is option A, Atolls

Explanation:

Atolls are coral reef island which surrounds lagoon. They are made up of volcanoes that resides under the water and thus these Atolls also remain hidden inside the water. This coral reef is also known as fringing reef because it forms fringes while surrounding an island below the water body . Atolls are involved in saving the island or sea.