Which ocean is the third largest in the world?

The third largest ocean in the world is indeed the Indian Ocean. When considering the sizes of the oceans, they are ranked primarily by their surface area. The Pacific Ocean holds the title of the largest ocean, followed by the Atlantic Ocean, which is the second largest. Following these, the Indian Ocean comes in as the third largest. This classification is based on their measurement of total area, which is a significant aspect in understanding the geography and distribution of Earth's water bodies. The other choices do not pertain to the size ranking but are simply descriptive terms that do not specify any ocean. Hence, identifying the correct size ranking, as indicated by the answer, is essential for a comprehensive understanding of global geography.