The correct answer is B. Natural resources
The Industrial Revolution developed due to access to abundant natural resources and increased agricultural production which saw the population of Britain increase. The vast supply of natural resources such as coal were vital in running the factories
They both wanted to solve the nations problems in conquest.
They competed in various ways, but primarily militarily and through space. Each built its military up to best one another, especially through the development of nuclear weapons. Space aspects, each side was in a space race to develop better and better space technology, which also partially related to military missile development.
Psychologicaly, it was terrifying for people. You didn’t know if a war would start the next day. Nuclear drills were common, which didn’t help either.
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