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.

Thom bell , bobby martin , and norman harris .