The correct answer is A) the list man changing the discharge location of the chutes. When a vessel develops a list during cargo loading, the list can be corrected by shifting the discharge location of the cargo chutes. This allows the cargo to be distributed more evenly across the vessel, counteracting the list. The other options are not the best solutions - B) allowing the grain to level itself may take too long, C) the compensating tanks would not be an immediate solution, and D) trimming the final loading cone by hand would be a slow and imprecise method.