In order to prevent the unnecessary release of hydrocarbons to atmosphere, when taking on departure ballast, one method used is to _________.

Correct Answer: Option C — allow entering ballast to displace the inert gas to a tank where cargo is currently being discharged

To minimize hydrocarbon emissions during ballast operations, inert gas is displaced from the ballasting tank into a tank currently being discharged. This closed-loop transfer prevents the venting of volatile organic compounds (VOCs) into the atmosphere, adhering to environmental protection standards and vapor emission control requirements for tankers.