Whose explorations led to a greater knowledge of North America, the Arctic, Australia, and the Hawaiian islands?

Robert de La Salle’s and Henry Hudson’s
Henry Hudson’s and James Cook’s
Samuel de Champlain’s and Robert de La Salle’s
James Cook’s and Samuel de Champlain’s

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a.the united states declined to assist south vietnam against the north. b.us leaders authorized south vietnam to invade north vietnam. c.the president did not sign the gulf of tonkin resolution. d.congress authorized the president to escalate the conflict.