Which of the following is considered a high explosive?

RDX, or Research Department Explosive, is classified as a high explosive due to its chemical composition and properties. High explosives are characterized by their ability to detonate, producing a rapid release of energy that generates a powerful shock wave. RDX is widely used in military applications and demolition because of its stability and high detonation velocity.

In contrast, the other materials listed do not possess the necessary characteristics to be classified as high explosives. Gasoline is a flammable liquid but does not detonate; it burns in a rapid combustion reaction rather than an explosive detonation. Charcoal and wood shavings are combustible materials used primarily as fuels; they ignite and burn but do not have the properties needed for detonation. Thus, RDX stands out as the only material in this list that meets the criteria for a high explosive, making it the correct choice.