Which of the following is NOT a type of grenade?

The correct answer is based on the classification and purpose of different types of grenades. Fragmentation grenades are designed to disperse shrapnel upon detonation, causing damage to adversaries in a wide area. Incendiary offensive grenades are intended to ignite fires or create destruction through heat and flames, often used against flammable targets or to create chaos in enemy positions. Chemical smoke grenades are used to create visual obscuration, signaling, or even chemical warfare; they release smoke or chemicals when detonated.

The term "explosive breaching" refers to a method or technique rather than a specific type of grenade. Breaching explosives are typically used in demolition operations to create entry points through barriers, but they do not classify as grenades in the conventional sense. Grenades are generally handheld or thrown devices that detonate upon impact or after a set delay, with larger explosive breaching materials being more akin to specialized charges used in military operations rather than to the handheld grenades listed.