Read the excerpt about Mary Kingsley from Into the Unknown by Stewart Ross. How would she travel upriver? By now, paddle-wheel steamers regularly journeyed as passenger ferries along African rivers. On the morning of June 5, Kingsley set off from the port of Glass on the Mové, a French paddle steamer with a wood-burning boiler. By now steam technology had greatly improved.

Which text feature best supports the excerpt?

Mary Kingsley and others on a ship in a river.
A docked riverboat.
A map of Kingsley's travels up the Ogoou River in 1895.
A drawing of a fish.