The correct answer is A) bow. When a vessel is aground at the bow, it is preferable to remove any weight from the bow section. This is because the weight at the bow can increase the grounding and cause further damage to the vessel. By removing weight from the bow, the bow will become lighter and easier to free from the grounding. The other options are incorrect because removing weight from the stern or mid-section would not directly address the issue of the bow being grounded. In fact, removing weight from these areas could potentially make the situation worse by shifting the vessel's center of gravity and making it more difficult to free the grounded bow.