Final answer:
AFFF stands for Advanced Fire Fighting Foam. It is a fire extinguishing agent used to suppress liquid fuel fires.
Step-by-step explanation:
The correct answer is a. Advanced Fire Fighting Foam. AFFF is an acronym for Advanced Fire Fighting Foam. It is a type of fire extinguishing agent that is used to suppress and extinguish liquid fuel fires, such as gasoline or oil fires. AFFF works by forming a thin film on the surface of the fuel, separating it from the oxygen in the air and thus preventing the fire from spreading or reigniting.