The biggest problem you generally encounter while towing a single tow astern is __________.

Correct Answer: Option A — yaw

Yawing is the most significant challenge when towing a single vessel astern, particularly in heavy seas. It occurs when the towed vessel oscillates from side to side, potentially causing the tow to sheer out of control, increasing drag, and placing dangerous, erratic side-loading stresses on the towing hawser.