If you discover a fire in port on a security round you should first...

Correct Answer: Option D — Report it via telephone, UHF radio, or by pulling an alarm

Immediate notification is the highest priority upon discovering a fire. Utilizing established shipboard communication channels—such as the general alarm, bridge telephone, or dedicated emergency radio frequencies—ensures the bridge team can initiate the emergency response plan, muster the fire party, and coordinate with shore-side emergency services if necessary.