Explanation:

The first confirmed sighting of the Antarctic mainland is generally attributed to a Russian expedition led by Fabian Gottlieb von Bellingshausen (likely 'Fabian Welling Shawson' in the option) and Mikhail Lazarev on January 27, 1820. Bellingshausen's expedition sighted an ice shelf confirmed to be part of the mainland. Option (1) James Cook circumnavigated Antarctica but did not sight the mainland. Option (3) Roald Amundsen was the first to reach the South Pole, much later. Option (4) Abel Tasman explored Oceania, not Antarctica.