Which of the following correctly matches a common ammunition component with its function?

• A. Projectile provides the physical form
• B. Propellant provides the expanding gas
• C. Primer initiates ignition
• D. Fuze provides timing or initiation function

Answer: (B)

Propellant is the source of the rapidly expanding gas that creates the high pressure behind the bullet, pushing it down the barrel and out of the muzzle. The primer starts this process by igniting the propellant; the projectile is simply the mass being accelerated, not the gas source; and a fuze is a timing or initiation device used in other ordnance, not the mechanism that propels a standard cartridge. So the best match is that propellant provides the expanding gas.