Which of these occurred during early u. s. industrialization? a) manufacturers instituted a five-day workweek. b) labor laws required factories to provide a safe working environment. c) workers were required to attend schools to develop technical skills. d) production of goods transitioned from homes to factories.

D)Production of goods transitioned from homes to factories.

It is not C, because that only appeared after jobs that needed more skill was required.
It is not B, because there was a time period named the "Industrial Age", in which nature was not thought of as much until later
It is not A, because that was after the Labor-day Act(?) in which work-days and amount of time each day was instituted.

hope this helps