Describe the functioning mechanism of a blowback operated weapon.

The functioning mechanism of a blowback operated weapon relies on the inertia of the bolt, making option C the correct choice. In a blowback system, when the round is fired, the high-pressure gas generated forces the projectile down the barrel. This gas pressure also acts on the bolt, which remains held in place due to its weight. The bolt is kept in a closed position until the projectile exits the barrel, allowing pressure in the chamber to drop to a safe level. Once this occurs, the bolt can move backward to eject the spent cartridge and chamber a new round.

This mechanism is fundamental to blowback operation, as it does not require additional locking mechanisms like more complex operating systems. Understanding this principle is key when discussing how semi-automatic and automatic firearms function within this category.