What is the REF for Composition C-4?

The correct answer is based on the Relative Effectiveness Factor (REF) for Composition C-4, which is a plastic explosive commonly used in military applications. The REF is a measure of the explosive's effectiveness compared to a reference explosive, typically TNT.

Composition C-4 has a REF of 1.37, which indicates that it is 37% more effective than TNT. This effectiveness is due to its higher density and the chemical composition that allows it to convert a greater percentage of its mass into explosive energy. The value of 1.37 reflects the properties of Composition C-4, including its velocity of detonation and pressure, which contribute to its superior performance in comparison to other explosives.

In this context, while the other options represent different values, they do not accurately represent the REF for Composition C-4. Therefore, understanding the characteristics of C-4 and its relative effectiveness is crucial when identifying the correct REF.