Question

which part of a modern firearm has the same function as the lock on a muzzleloader? a safety b trigger c action d barrel

Explanation:

The lock on a muzzleloader was responsible for igniting the powder charge. In modern firearms, the action plays a crucial role in the firing mechanism, similar to how the lock was integral in muzzleloaders for the firing process. The safety is for preventing accidental firing, the trigger is for initiating the firing (but the action has a more comprehensive role in the mechanism like the lock did), and the barrel is for the projectile path.

Answer:

C. action