**Core Concept**
The question pertains to the composition of double base smokeless gun powder, which is a type of propellant used in firearms. Double base smokeless gun powder is a high-performance propellant that contains a combination of nitrocellulose and nitroglycerin as its primary components.

**Why the Correct Answer is Right**
Double base smokeless gun powder gets its name from the fact that it contains two types of nitrocellulose: a primary nitrocellulose and a secondary nitrocellulose. The primary nitrocellulose is a high-nitrogen content nitrocellulose that provides the majority of the propellant's energy, while the secondary nitrocellulose serves as a binder to hold the powder grains together. The addition of nitroglycerin to the primary nitrocellulose increases the powder's energy density and burning rate. This unique combination of nitrocellulose and nitroglycerin makes double base smokeless gun powder a highly efficient and powerful propellant.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the composition of double base smokeless gun powder.

**Option B:** This option is incorrect because it is a type of propellant used in rockets, not firearms.

**Option C:** This option is incorrect because it is a type of propellant used in historical firearms, not modern firearms.

**Clinical Pearl / High-Yield Fact**
It's worth noting that double base smokeless gun powder is highly sensitive to temperature and humidity, which can affect its performance and stability. This is why firearms manufacturers often take great care to ensure that their products are stored and handled in a controlled environment.

**Correct Answer:** C.