Final answer:
Halon and ammonium phosphate extinguishing agents primarily work by removing the fuel source.
Step-by-step explanation:
The extinguishing agents halon and ammonium phosphate primarily work by removing the fuel source. Halon is a type of fire extinguisher that contains bromine-containing compounds, which are effective at putting out fires. These compounds work by interrupting the chemical reactions that sustain the fire, essentially removing the fuel source.