In 1978 there were six aspiring astronauts at the Johnson Space Center in Huston. At the beginning the space veterans did not believe women would be ready to perform that role. So, to dispel such prejudices, they did as well or better than men. They were smart, tough, highly educated and meticulous. They met the challenge, they studied hard and they demostrated they were capable of doing it.
Since the population of the cities increased with more factories being built, A seems to be the best choice: More people moved to the city in order to work in the factories.
