Question 4613 Deck General

The correct answer is A) zero. When a MODU (Mobile Offshore Drilling Unit) is inclined at an angle of loll, in the absence of external forces, the righting arm (GZ) is zero. This is because the center of gravity (G) and the center of buoyancy (B) are aligned vertically, resulting in no righting moment to restore the MODU to the upright position. The other options are incorrect because: B) the righting arm would not be vertical, C) the righting arm is not positive when there are no external forces, and D) the righting arm is not negative in the absence of external forces.