Which quotation most accurately explains why Kennedy gave this speech? "'Yet the vows of this Nation can only be fulfilled if we in this Nation are first, and, therefore, we intend to be first.'"

"'Its conquest deserves the best of all mankind, and its opportunity for peaceful cooperation may never come again.'"

"'There is no strife, no prejudice, no national conflict in outer space as yet.'"

"'For space science, like nuclear science and all technology, has no conscience of its own.'"