**Core Concept**
Double base smokeless gunpowder is a type of propellant used in firearms, consisting of a mixture of nitroglycerin and nitrocellulose. The nitroglycerin serves as the primary oxidizer, while the nitrocellulose acts as the fuel, producing a rapid release of gases when ignited.

**Why the Correct Answer is Right**
The combination of nitroglycerin and nitrocellulose in double base smokeless gunpowder allows for a more efficient release of energy, resulting in higher velocities and less smoke compared to traditional black powder. The nitroglycerin decomposes to form carbon dioxide, water, and nitrogen gas, while the nitrocellulose decomposes to form carbon dioxide and nitrogen gas. This decomposition process releases a large amount of gas, which is then expelled through the barrel of the firearm, propelling the projectile.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely a distractor, as there is no commonly known type of smokeless gunpowder by this name.
**Option B:** This option is incorrect, as it does not accurately describe the composition of double base smokeless gunpowder.
**Option C:** This option is also incorrect, as it does not accurately describe the composition of double base smokeless gunpowder.

**Clinical Pearl / High-Yield Fact**
It's worth noting that the use of double base smokeless gunpowder has led to the development of more efficient and safer firearms, but it also poses a risk of explosion if not handled properly.

**Correct Answer: C. Nitroglycerin and nitrocellulose.**