The correct answer is B) extinguishes a fire by absorbing heat and reducing the supply of oxygen. High-velocity fog, also known as water mist, is an effective fire extinguishing agent because it absorbs heat from the fire and reduces the supply of oxygen needed to sustain the fire. The fine water droplets in high-velocity fog have a large surface area-to-volume ratio, allowing them to rapidly absorb heat and cool the fire. Additionally, the water mist displaces oxygen, further contributing to fire suppression. The other answer choices are incorrect because: A) does not accurately describe the reach of high-velocity fog, C) is a characteristic of low-velocity fog, and D) is not a requirement for high-velocity fog systems.