As Chief Engineer you should understand the concept of corrective measures and their purpose. The following four actions will have which affect on the vessel? 1) Add weight low and symmetrically about the center line. 2) Remove high weight symmetrically. 3) Move weight down symmetrically. 4) Eliminate any free surface present.

Correct Answer: Option D — To move the center of gravity down to a position below the metacenter and remove an angle of loll.

Adding low central weight, removing high weight, lowering existing weight, and eliminating free surface all serve to lower the vessel's vertical center of gravity (KG). This increases the metacentric height (GM), providing a positive righting moment capable of overcoming an unstable angle of loll.