Which of the following is a part of a bolt-action rifle?

A bolt-action rifle is a type of firearm characterized by a manually operated bolt mechanism that chambers cartridges. Each of the components listed plays an essential role in the operation and function of the rifle.

The barrel is a critical part of the rifle, through which the bullet travels when fired. Its design influences accuracy and projectile velocity. The muzzle is the front part of the barrel where the bullet exits; it's crucial for determining the rifle's communication with external elements. The safety is a mechanism that helps prevent accidental discharges by blocking the firing pin or sear until the shooter intentionally disengages it.

Hence, all of these components—barrel, muzzle, and safety—are integral parts of a bolt-action rifle, making the selection that includes all of them the correct choice. Recognizing the significance of each part enhances understanding of how firearms operate and promotes safe handling practices.