Which of the following would be a good extinguishing agent for a grade B product of 1,3-Pentadiene?

Correct Answer: Option D — Foam

For hydrocarbon derivatives like 1,3-pentadiene, alcohol-resistant or standard foam is the primary extinguishing agent specified under USCG firefighting guidelines. Foam blankets the fuel surface, smothering the fire and suppressing flammable vapor evolution more effectively than water streams.