The correct answer is B) that it be power ventilated. The reason is that the regulations require pump rooms on tank vessels carrying grades B or C liquid cargo to be provided with power ventilation, regardless of the vessel's construction date or the location of the machinery spaces. This ensures adequate airflow and circulation to prevent the buildup of flammable vapors in these potentially hazardous spaces. The other options are incorrect because: A) extended ducts to the weather deck may not provide sufficient ventilation; C) a vent header system is not a standalone requirement; and D) gooseneck vents and flame screens are not a substitute for power ventilation in this case.