What took place during the Classical Era that improved basically every area of life?

Age of Enlightenment

Industrial Revolution

the discovery of oxygen

American Revolution

I think the correct answer from the choices listed above is the second option. It is the Industrial Revolution that took place during the Classical Era that improved basically every area of life. The Industrial Revolution made machine-based manufacturing more common, and increased the population and average income. Many jobs were available which raise the status of most people.