Before firing at game, what is crucial to ensure a clean kill and avoid wounding?

It is important to always be sure of your target and what is beyond before firing at game. This means being able to fully identify and clearly see the target, as well as being aware of what is in the surrounding area to avoid accidentally harming something or someone else. Options A and B are distracting and can potentially lead to careless mistakes, while option C is a minor factor compared to ensuring the safety and ethical killing of the game.