Question 2575 Deck Safety

The correct answer is A) Tanks: DB3, DB4. To increase the calculated GM (Metacentric Height) from 3.0' to 4.2', you need to increase the vessel's righting moment. This can be achieved by ballasting the tanks that have the greatest impact on the vessel's stability. According to the Stability Data Reference Book, the tanks DB3 and DB4 have the largest lever arms (distance from the center of gravity) and will provide the most effective increase in righting moment to achieve the desired GM of 4.2'. The other answer choices are incorrect because they either do not have the largest lever arms (B, C, D) or do not provide the necessary increase in righting moment to reach the target GM (B, C, D).