The correct answer is: "The transportation and navigation of goods is part of the constitutional definition of commerce."
This can be inferred from the excerpt where Chief Justice John Marshall states that the word "commerce" includes navigation and that it is universally understood in America to encompass navigation as well. He argues that commerce among the states cannot be restricted to the external boundaries of each state, but can be introduced into the interior. This implies that the transportation and navigation of goods is considered part of commerce according to the Constitution.