Answer:
Explanation:
I believe the answer is b? Yes, people back then did need to use advanced tools.
Sputnik, 1957. On October 4, 1957, the Soviet Union launched the earth's first artificial satellite, Sputnik-1. As a result, the launch of Sputnik served to intensify the arms race and raise Cold War tensions. During the 1950s, both the United States and the Soviet Union were working to develop new technology.
In 1950 it was 9% but increased to about 90% towards the end of the 1950’s sorry if this does not help
