1. an early system of ? developed during the first industrial revolution.
2. the factory system before the civil war used fewer ? in producing goods.
3. hiring ? in the first industrial revolution meant production costs dropped.

Iwould say c is the best answer choice

Well, by looking at your question and also your answers that you have provided your answer to your question is going to be choice a) protestants.this is because they had been a member of or follower of any of the western christian churches. these churches had been separated  from the roman catholic  church and they follow the principles  of reformation, and baptism, and also the luthern churches, and finally  the  presbyterian.i hope this mark me as brainiest