Question 604General Subjects - Assistant Engineer

The correct answer is A) When the discharge is necessary for the purpose of securing the safety of a ship or saving life at sea. This is the correct answer because 33 CFR Subchapter O, which governs oil pollution prevention regulations, specifically allows for the discharge of oil or oily mixture to the sea when it is necessary to secure the safety of a ship or save life at sea. This exception is made in recognition of the need to prioritize the safety and preservation of human life in emergency situations, even if it results in a discharge that would otherwise be prohibited. The other answer choices are incorrect because B) allows a discharge only if the oil content is below 100 parts per million, which is a more restrictive standard than the safety exception. Options C and D are not valid exceptions under the regulations.