Egress Explosive Safety Practice Test

Mass explosion hazard is the key idea here. When an explosive item is classified as having a mass explosion hazard, a single initiating event could cause a detonation that involves almost the entire contents, producing a blast of very large destructive force. That’s why the appropriate hazard division is the one that represents mass explosion risk.

The other divisions describe different, less severe or different types of hazards: a projection of fragments without a mass blast, a fire hazard without a mass explosion, or only a minor explosion. So the division associated with mass explosion is the correct one, which is why this choice fits best.