Under the regulations implementing MARPOL, a mobile offshore drilling unit is required to have an International Oil Pollution Prevention (IOPP) Certificate when the unit __________.

Correct Answer: Option C — engages in a voyage to a port of another country which is a party of MARPOL

MARPOL Annex I requires an International Oil Pollution Prevention (IOPP) Certificate for vessels engaged in international voyages. For a MODU, this requirement is triggered when the unit departs domestic waters to engage in a voyage to a port or offshore terminal of another country that is a MARPOL signatory.