Without the specific image to reference, I can infer from historical context. The primary objectives of Jefferson's expedition for Lewis and Clark included gaining knowledge of the region's geography, documenting a safe route to the Pacific Ocean, and learning about the territory's Native Americans.
If the illustration depicts landscapes, waterways, or routes, it likely represents "documenting a safe route to the Pacific Ocean." If it features maps, navigational details, or geographic features, it would best represent "gaining knowledge of the region's geography." If it shows interactions with Native Americans or cultural exchanges, it aligns with "learning about the territory's Native Americans."
Please consider the content of the image when choosing the best response.