With regard to a ballast system associated with a dry cargo ship, what is the primary purpose of the double-bottom ballast tanks?

Correct Answer: Option A — Adjusting the overall draft of the vessel or correcting a condition of list.

Double-bottom tanks are distributed across the vessel's breadth and length. Because they are subdivided into port and starboard sections, they provide the necessary flexibility to adjust the overall mean draft or correct a list by selectively ballasting specific tanks to restore the vessel to an even keel.