While crossing a river on the Great Lakes System, which statement is TRUE if a power-driven vessel is ascending the river?

Answer: B — The ascending vessel has the right of way.

In situations involving navigation on a river, the rules stipulate that power-driven vessels ascending the river generally have the right of way over vessels that are descending. This is based on the principle that vessels transiting upstream often have greater difficulty in maneuverability compared to those moving downstream due to the current and potential restrictions in channel width. Consequently, a vessel rising in the river has the precedence in passage. This understanding ensures safe navigation as it allows the ascending vessel, which may be more burdened by the current and its own propulsion challenges, to proceed with less interruption. Therefore, when you encounter a power-driven vessel ascending the river, it is important to recognize its right of way and yield accordingly to avoid any collisions or risky situations.