In “Captain Canot, or Twenty Years of an African Slaver,” how does the author develop the central idea that transporting enslaved captives was a trade just like any other? by suggesting that captives led poor lives in Africa

by describing how captives were loaded on the ships

by analyzing the day-to-day activities aboard a slave ship

by explaining how a captive’s condition was assessed

by explaining how a captive’s condition was assessed.

Explanation:

The author developed the central idea that transporting enslaved captives was a trade just like any other in "Captain Canot" or "Twenty Years of an African Slaver" by explaining how a captive’s condition was assessed.

Most trades or all trades have profit as its main driving force, and profit cannot be made if the goods you sell is not good enough, so slave masters had to assess a captive's condition to find out if he was good enough to make a profit or not just like any other trade.