Final answer:
The quote from Sewall’s ‘The Selling of Joseph’ that best represents his view on slavery is that those who treat humans as property have lost their humanity.
Step-by-step explanation:
The quote that best states Sewall's view on slavery is a) For he that shall in this case plead Alteration of Property, seems to have forfeited a great part of his own claim to Humanity. This statement underlines the core of Sewall's argument against slavery by suggesting that those who view and treat human beings as property have lost touch with their own humanity. In his pamphlet, The Selling of Joseph, Sewall presents a humanistic and moral standpoint that aligns with the abolitionist movement by challenging the idea of humans as property and advocating for the rights and liberty of enslaved individuals.