Dry chemical fire extinguishing agents:
a. Alter the vapor phase concentration of the fuel oxidizing agent.
b. Stop the chemical chain reaction sequence associated with fire.
c. Cool the fuel/oxidizing agent mixture below the ignition temperature of the fuel.
d. Place a barrier, or effective separation, between the fuel and the oxidizing agent (usually air).
e. Are ineffective on fires involving combustible liquids.
Answer: B