The Oil Record Book on a vessel NOT engaged on a foreign voyage shall be maintained on board for not less than __________.

Correct Answer: Option C — 36 months

Under 33 CFR 151.25, the Oil Record Book must be maintained on board for a period of not less than three years (36 months). This record is subject to inspection by the Coast Guard to verify compliance with MARPOL Annex I and domestic pollution prevention regulations regarding oily waste management.