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The answer is D. <span> invention of the first steel tools
Actually, this very topic is still a hot debate among scientists because the shift happens on different reasons in each region of the world.
But one thing they have in common is that Steel tools give the member of early societies the capabilities to rake uplands and cutting up crops that really useful in farming and herding.</span>
The author states that the Soviet Union’s launch of Sputnik caused the United States to begin investing in science, technology, and innovation. Sputnik’s successful launch caused this reaction in the United States because the Cold War led Americans to fear the possibility of the Soviet Union leading the world in science and technology. Rather than give in to fear or hide from challenge, the United States stepped up and made a commitment to science, math, and innovation.
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