Flanking rudders effect a vessel's heading because of the __________.

Correct Answer: Option B — effect of the propeller flow on the rudders

Flanking rudders function by intercepting the propeller discharge current. Because they are located forward of the propellers, they redirect the high-velocity water flow, allowing the operator to steer the vessel effectively while moving astern. This is essential for towboats navigating confined waterways with heavy barges in tow.