With regards to a ship's Oil Record Book, an oil tanker of 150 gross tons and above must maintain entries in ________.

Correct Answer: Option C — Both Part I and Part II

MARPOL Annex I requires oil tankers of 150 gross tons and above to maintain both Part I (Machinery Space Operations) and Part II (Cargo/Ballast Operations). Part I applies to all ships, while Part II is specific to tankers handling oil cargo, ensuring comprehensive oversight of all potential pollution sources.