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Which part of the firearm loads, fires, and ejects shells or cartridges?
Barrel
Action
Stock
Trigger
The correct answer is: Action
The correct answer is the action. The action of a firearm is the part that loads, fires, and ejects shells or cartridges. It is crucial for the proper function of the firearm. The barrel (choice A) is where the projectile travels through after being fired, the stock (choice C) is the part of the firearm that is held against the shooter's shoulder, providing support and stability, and the trigger (choice D) is the mechanism that, when pulled, initiates the firing sequence.