Which of the following is an inherent advantage possessed by a twin-screw vessel in opposition to a single-screw vessel?

Correct Answer: Option D — The side forces will be cancelled out

Twin-screw vessels utilize counter-rotating propellers, which effectively cancel out the individual transverse thrust forces of each screw. This symmetry provides superior directional stability and eliminates the inherent 'walking' tendency found in single-screw vessels, making the ship much easier to handle in confined waters.