When using foam, what two components must be matched based on gallons per minute?

The correct choice highlights the importance of matching the educator and nozzle based on their flow rates in gallons per minute to ensure effective foam generation and application. The educator is the device that introduces foam concentrate into the water stream, while the nozzle is responsible for dispersing that mixture as a foam.

When the educator and nozzle are not properly matched, it can lead to insufficient foam production or an improper foam consistency, both of which can drastically reduce the effectiveness of firefighting efforts. For example, an educator designed for a higher flow rate won't function optimally with a nozzle that operates at a significantly lower flow rate, potentially resulting in a failure to produce the necessary foam coverage.

The other options, while relevant to fireground operations, do not directly pertain to the critical relationship necessary for foam effectiveness. The tank-pump relates to the water source and pressure, hose-fitting deals with the connections in the hose system, and foam-water focuses on the mixture, but none emphasize the vital match required between the educator and nozzle.