Which extinguishing agent is effective in combating an isoprene fire?

Correct Answer: Option D — All the above

Isoprene is a highly flammable monomer. Effective firefighting requires suppressing the vapor and cooling the fuel. Foam provides a vapor-sealing blanket, dry chemicals interrupt the chemical chain reaction, and CO2 displaces oxygen. All these agents are recognized as effective tools for managing fires involving volatile hydrocarbon monomers like isoprene.