Which principle states that the minimum number of people should be exposed to the minimum amount of explosives for the minimum time?

• A. Least Exposure Principle
• B. Minimize Risk Principle
• C. Exposure Reduction Principle
• D. Cardinal Principle of Explosives Safety

Answer: (D)

The idea being tested is to minimize harm by restricting who and how long they are exposed to explosives, and by using only what is truly needed. The best answer names the established Cardinal Principle of Explosives Safety, which explicitly says to keep the number of people exposed to the minimum, use the smallest amount of explosive necessary, and limit the exposure time as much as possible. This principle is what guides how we plan and conduct activities involving explosives: set up exclusion zones, use remote or automated handling, control access, and sequence detonation to reduce who is near the blast, how much material is present, and for how long the area is at risk. Other-sounding phrases may refer to exposure or risk, but they don’t capture the formal guideline that ties together the three factors—people, quantity, and time—into a single, recognized safety standard.