Kennedy put forward the slogan of "new frontier" when he participated in the US presidential campaign in 1960, that is, "today's new frontier is an unknown field of science and space, an unresolved peace and war issue, and an unconquered isolation zone of ignorance and prejudice."

After he became president, he vigorously developed space technology. The fundamental purpose of the theory of "new frontier" is (b).

A. comprehensively strengthen government intervention in the economy

B. Ensuring American world hegemony

C. Comply with the requirements of the third scientific and technological revolution

D. Expanding American territory