I was very loth to sell [xury], who had assisted me so faithfully in procuring my own [freedom]. however, when i let [the captain] know my reason,...[he]offered me this medium, that he would give the boy an obligation to set him free in ten years, if he turned Christian. what does the passage reveal about the times defoe was writing about? a. europeans felt christians should be enslaved for only short periods b. slavery was more common among christians that other people c. europeans felt christians should not be enslaved d. slavery was more common at sea that it was on land