How is the central idea that enslaved captives were treated inhumanely developed in “Captain Canot, or Twenty Years of an African Slaver"?

Responses

by contrasting how the captives were managed on other ships
by contrasting how the captives were managed on other ships

by describing how the captives were handled on the ship
by describing how the captives were handled on the ship

by describing how captives were selected to be slaves
by describing how captives were selected to be slaves

by explaining the monetary value of the enslaved people

by explaining the monetary value of the enslaved people