15. - THE WORK WHICH USUALLY ______ IN THE HOUSES OF THE PEOPLE BEGAN TO BE CARRIED ON IN LARGE MILLS OR FACTORIES, AND WORKERS FOUND IT CONVENIENT TO LIVE NEAR THEM?

15. - THE WORK WHICH USUALLY ______ IN THE HOUSES OF THE PEOPLE BEGAN TO BE CARRIED ON IN LARGE MILLS OR FACTORIES, AND WORKERS FOUND IT CONVENIENT TO LIVE NEAR THEM. A) Was done b) Were made c) Were done d) Was made.