Which of the following is a fundamental rule of firearm safety?

One fundamental rule of firearm safety is to always treat every firearm as if it is loaded. This means that even if you have checked and unloaded your gun, you should still handle it with the utmost care and caution. Option A is incorrect because keeping your finger on the trigger can increase the risk of accidental discharge. Option B is incorrect because firearms should be unloaded before and after hunting, not just when you are finished hunting. Option D is incorrect because you should never point a firearm at anything you find interesting, as this could cause harm to yourself or others. Therefore, the most important rule to remember is to always treat every firearm as if it is loaded, to ensure the safety of yourself and those around you.