What led new england farm girls to resign from working in the mills and return to their family farms in the 1840s?

In the 1840s, New England farm girls resigned from working in the mills and return to their family farms because they fear of losing their jobs and their boarding houses became overloaded so the rental fee was costly and it didn't offer worthy foodstuff and home materials. Their wages also are even if they work longer hours. 

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.