In accordance with the international MARPOL Annex VI regulations, the nitrous oxide (NOx) emissions associated with certain diesel engines are required to operate under certain acceptable limits. To which of the listed engine applications would the NOx emission regulations apply?

Correct Answer: Option A — Diesel engines with a power output of more than 130kW.

MARPOL Annex VI regulates NOx emissions for marine diesel engines with a power output exceeding 130 kW. This regulation mandates compliance with specific emission tiers based on the engine's installation date and rated speed, aiming to reduce nitrogen oxide pollution from international shipping operations globally.