The correct option is:
Migration of new settlers into Arkansas.
There was not any migration of new settlers into Arkansas as a result of the Lewis and Clark expedition. The expedition did return to St. Louis to report its findings to Jefferson, with maps, charts, and research journals. They also did have encounters with native American fur traders. They too collected information on natural resources and plants, since Jefferson believed that scientific data on animals and plants would strengthen his claim of ownership to the Pacific Northwest.