Final answer:
The minimum flash point for JP-5 jet fuel is option C, which is 140°F, as it needs to be high enough to minimize accidental ignition risks at normal operating temperatures.
Step-by-step explanation:
The minimum flash point for JP-5 jet fuel in degrees Fahrenheit (°F) is option C, 140°F. A flash point is the lowest temperature at which a substance can vaporize to form a ignitable mixture in air. According to the guidelines provided, flash points that are below 73°F are rated as 4, those below 100°F as 3, and those above 100°F but not exceeding 200°F as 2. Since JP-5 jet fuel is a type of fuel used in aircraft, its flash point must be sufficiently high to minimize the risk of accidental ignition at normal operating temperatures. The minimum flash point for JP-5 is well above the highest temperature range for option C, which is 40°F, making it the correct choice.