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A placarded vehicle must carry a fire extinguisher with a minimum rating of

A
Explaination
All placarded vehicles are required to have a fire extinguisher with a minimum UL rating of 10 B:C. That is, it must be able to extinguish a 10-square-foot class B fire (which includes almost all flammable liquids) and must be electrically non-conductive (hence its C rating).