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Class B foam is specifically designed to combat flammable liquid fires, which are common in various settings such as chemical spills or fuel fires. One of the primary functions of Class B foam, in addition to extinguishing flames, is to suppress flammable vapors. When applied to a burning liquid, the foam forms a blanket over the surface, effectively sealing in the fuel and preventing the release of combustible vapors into the atmosphere. This vapor suppression is crucial because it not only aids in extinguishing the fire but also reduces the risk of re-ignition, making it a vital aspect of fire safety and firefighting strategies involving flammable materials.

The other functions suggested by the other options, while relevant to firefighting in general, do not specifically highlight the unique capabilities of Class B foam. For example, cooling the environment is typically achieved through water application. Reinforcing structural integrity and enhancing visibility are not primary roles of Class B foam; thus, these options do not capture the significance of vapor suppression, which is essential for effective fire control in flammable liquid incidents.