Final answer:
The correct term for the lowest temperature at which a flammable liquid emits enough vapors to support combustion when mixed with air is the 'Flash point'.
Step-by-step explanation:
The lowest temperature at which a flammable liquid gives off sufficient vapors, when mixed with air to support combustion, is known as a product's B. Flash point. The boiling point is defined as the temperature at which the vapor pressure of a liquid equals the pressure of the gas above it, which is different from the concept of a flash point. At the boiling point, the liquid's vapor pressure equals the ambient pressure, and liquid and gas phases are in equilibrium. In contrast, the flash point refers to the minimum temperature at which a liquid forms a vapor above its surface in sufficient concentration that it can be ignited in the air.