D is the only non fragment sentence here, so it must be correct
Because the remaining workers had more tools and land to work so they became more productive so they produced more. When workers are working harder employers are willing to pay more.
Recently converted Britons, if we're talking about the Middle ages and the wave of christenings that were occuring at the time, then we can say that they were at first somewhat reluctant about their new faith. Over time, however, they had grown accustomed to it and respected it deeply.