Believing that truth is what works for actual real people Harvard psychologist James developed the psychology of "positive reenforcement" which implies that people can do good if they know what they're trying to do is truthful and "correct".
Answer:
A
Explanation:
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.
Answer: Alexander The Great.