The correct answer is D) None of the above. The reason this is the correct answer is that there is no general rule granting right-of-way to power-driven vessels crossing on the Western Rivers over ascending or descending vessels. The Western Rivers navigation rules do not contain such a provision. The right-of-way is generally determined by the vessel's direction of travel, size, maneuverability, and other factors, rather than whether the vessel is crossing or running with the current. Options A, B, and C are incorrect because they state a right-of-way rule that does not exist in the Western Rivers navigation regulations.