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Answer:
a- the arrangement of spiral grooves on the inside of a rifle barrel.
b- When a handgun is fired, the rifling in the barrel puts a spiral spin on the bullet.
c- Rifling works by spinning the projectile about its axis, causing gyroscopic forces that spin-stabilize it throughout its flight; tighter rifling will spin a bullet faster, while looser rifling will spin a bullet slower.
Explanation: i don't have one