Why did many children work in the 1800s

When the Industrial Revolution started, many families had to find someone to work or they wouldn't survive.

Explanation: cause it is

They needed to earn money for their families.

Explanation:

100% Right

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.