How does pulling the trigger of a pistol initiate the firing process?

Pulling the trigger of a pistol initiates the firing process by striking the primer, which causes the ignition of the gunpowder within the cartridge. When the trigger is pulled, it activates the internal components of the firearm that send a firing pin or striker forward. This pin contacts the primer at the base of the cartridge. The primer contains a sensitive explosive compound that detonates upon impact, generating a small flame that ignites the gunpowder. This ignition results in the rapid expansion of gases that propel the bullet down the barrel and out of the firearm.

The other choices refer to different aspects of a firearm's operation but do not directly relate to the initiation of the firing sequence. For example, activating the magazine relates to feeding ammunition, opening the action pertains to loading or unloading the firearm, and releasing the safety mechanism is aimed at enabling the weapon to fire. However, it is the striking of the primer that is the critical step in the firing process itself.