At which location does all firing take place?

The correct choice indicates that all firing occurs at the weapon. This understanding is crucial because it highlights that the weapon itself is the point where the projectile is expelled and the action of firing takes place. The weapon combines various components—including the chamber, barrel, and firing mechanism—that work together to enable firing.

When considering the context of marksmanship, emphasizing the weapon's role reaffirms the importance of proper handling, maintenance, and technique to ensure effective shooting performance.

Other locations mentioned, such as the target range, firing line, and observation point, serve specific roles in the training and shooting process. For instance, the target range is designated for practice, providing a safe distance to engage targets. The firing line is where shooters position themselves while aiming and firing. The observation point is generally used for assessing the results of firing or observing the practices of others. However, these places do not encapsulate the act of firing itself, which fundamentally occurs at the weapon.