A is the correct answer because there is no snow or rain on this Continent. The snow is not melting, because for years ice sheets were created.
All other answers are wrong, because Antarctica is not an iceberg or ice shelf, because it is a vast territory, but we can find both iceberg and ice shelf on Antarctica.
Of course, it is not a bay, because bay is only partially surrounded by land.
Gravity is the power by which a planet or other body draws objects toward its middle. The power of gravity keeps the entirety of the planets in circle around the sun.
