In twin-screw engine installations while going ahead, maneuvering qualities are most effective when the tops of the propeller blades both turn __________.

Correct Answer: Option B — outboard from the center

Outboard-turning twin screws (outboard from the center) maximize propulsive efficiency and maneuvering effectiveness by throwing water away from the hull. This creates clean water flow over the rudders and enhances lateral thrust vectors during ahead propulsion, consistent with standard marine engineering principles.