What is the composition of 5 gallons of AFFF?

The correct choice is based on the standard composition of Aqueous Film-Forming Foam (AFFF). AFFF is typically formulated to be effective in extinguishing flammable liquid fires by creating a barrier that separates the fuel from the oxygen in the air. The standard ratio for AFFF concentrate is commonly around 6% concentrate to 94% water, specifically when using sea water in marine environments.

In a scenario where 5 gallons of AFFF is prepared, the breakdown would involve mixing approximately 6% of the AFFF concentrate with 94% of water. This allows the concentrate to maintain its firefighting properties while ensuring that there's enough water to create an effective foam blanket when deployed.

This balance is critical for achieving the desired firefighting performance, as too low of a concentrate would reduce the effectiveness of the foam and potentially compromise its ability to suppress fires effectively. Therefore, choosing this specific composition indicates a correct understanding of how AFFF is prepared and the principles behind its use in firefighting situations.