The launch of Sputnik made Americans feel their security threatened and started the space race.
What is Sputnik?
Sputnik was the original artificial Earth satellite. By the Soviet Union on 4 October 1957, It was launched into an oval low Earth orbit as part of the Soviet space program. Sputnik, sometimes called Sputnik 1 went into space.
It orbited for three weeks before its electric battery ran out. Its radio signal was easily noticeable by radio amateurs, and the 65° orbital disposition and time period of its orbit made its flight path cover almost the entire settled Earth.
The Soviet Union not only launched the first artificial satellite in a single shot but also officially started a “space race” with the United States, therefore Americans started the space race and feel their security was threatened.
Hence, option B is correct.
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