Question 1158 Deck General

The correct answer is A) Pressure-vacuum relief valves. Adiponitrile is a hazardous cargo that requires pressure-vacuum relief valves for venting. This is in accordance with the regulations for the carriage of hazardous materials, which mandate the use of pressure-vacuum relief valves to safely vent any vapors or gases that may build up in the cargo tank. The other options are incorrect because open venting is not permitted for hazardous cargoes, closed venting without a vapor recovery system is not sufficient, and gooseneck vents with flame screens are not the required method for this specific cargo.