The correct answer is B) The flash point of a substance is lower than the ignition temperature. The flash point is the lowest temperature at which a substance can produce enough vapor to form an ignitable mixture with air. This is lower than the ignition temperature, which is the minimum temperature required for the substance to spontaneously ignite and continue burning on its own. The other options are incorrect because: A) The flash point is not the temperature at which a substance will spontaneously ignite - that is the ignition temperature, which is higher than the flash point. C) The flash point is not the temperature at which a substance, when ignited, will continue to burn - that is the ignition temperature. D) The flash point is not the temperature at which the released vapors will fall within the explosive range - the explosive range is defined by the lower and upper explosive limits, which are separate concepts from the flash point.