The correct options are
C He was the first to discover the sea route in the South of Chile.
D He was the first to perform circumnavigation around the Earth.
Circumnavigation is the complete navigation around an entire island, continent, or astronomical body.
Ferdinand Magellan was an explorer who navigated around the world and was the first human to cross the Pacific ocean. He was the first to discover the sea route between South Chile, which is now known as the Strait of Magellan.