Which of the following materials is NOT a Class 1 explosive?

Gasoline is correctly identified as not being a Class 1 explosive. The classification of explosives is primarily governed by the U.S. Department of Transportation and involves categorizing materials based on their properties and potential hazards. Class 1 explosives include those that are capable of a rapid release of energy such as black powder, dynamite, and small arms ammunition.

Black powder is a well-known explosive used historically in firearms and cannons. Dynamite, an influential advancement in explosives technology, utilizes nitroglycerin to achieve a powerful explosive reaction. Small arms ammunition refers to the rounds used in firearms, which contain explosives to propel a projectile.

In contrast, gasoline is a flammable liquid but does not meet the criteria for an explosive material under Class 1. It can ignite and burn rapidly, but it does not detonate in a manner that Class 1 explosives do, hence why it is classified differently in terms of hazard and storage regulations.