Recently three underwater geographical structures in the Indian Ocean have been named after Indian h...........

Science Affairs Ocean Research

Recently three underwater geographical structures in the Indian Ocean have been named after Indian historical figures. These names, proposed by India, were recently approved by

National Centre for Polar and Ocean Research (NCPOR)

World Meteorological Organization (WMO)

International Hydrographic Organization (IHO)

International Seabed Authority (ISA)

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Explanation:

Three underwater geographical structures in the Indian Ocean have been named after Indian historical figures and concepts: the Ashoka Seamount, Chandragupt Ridge, and Kalpataru ridge.

These names, proposed by India, were recently approved by the International Hydrographic Organization (IHO) and UNESCO’s Intergovernmental Oceanographic Commission (IOC).
These structures were discovered by the National Centre for Polar and Ocean Research (NCPOR), Goa, during international survey explorations.
Including these, there are now seven structures in the Indian Ocean named after Indian scientists or figures, with previous names honoring physicist CV Raman, oceanographer NK Panikkar, geologist DN Wadia, and the research vessel Sagar Kanya.

Hence option 3rd is correct.