The movement from rural to urban areas
Answer: state of nature / social contract
Explanation:
Theorists like Thomas Hobbes, John Locke, and Jean-Jacques Rousseau, developed different theories about the state of nature and the social contract, although their underlying ideas shared some similarities.
The state of nature refers to a real or hypothetical condition of humanity before any political association, and the social contract would be also either a real or hypothetical understanding about the rights and duties of the rulers and the ruled people.
B......... there's not much information to go on
Probably the companies that joined in marketing "personal computers" to consumers. That is when computers became smaller,more easily accessible, and people started to buy them for their homes. Before that, computers were gigantic things that only companies could afford. IBM, Apple, and Bill Gates and his software were some of the people who helped.