Which component of an inline muzzleloader is used to load the projectile?

The ramrod is the correct choice because it serves the specific purpose of loading the projectile into the barrel of an inline muzzleloader. Once the powder charge is placed inside the barrel, the ramrod is used to push the projectile down to ensure that it is seated properly against the powder. This is an essential step in the loading process to ensure accuracy and safety when firing the muzzleloader.

The other components listed do not have this function. The safety is a mechanism designed to prevent the firearm from being discharged accidentally. The stock is the part of the firearm that the shooter holds, providing stability and support when aiming and firing. The nipple is a small threaded fitting on the firearm, which serves as a place to attach a percussion cap that ignites the powder when the trigger is pulled. Each of these components plays an important role in the operation of the muzzleloader, but the ramrod is specifically designed for loading the projectile.