Final answer:
State laws vary on the age when leaving a loaded, unsecured firearm in the reach of a child is a misdemeanor. No specific answer to the multiple-choice question can be given as state laws differ without a common standard age indicated in the provided materials.
Step-by-step explanation:
The question asks at what age leaving a loaded, unsecured firearm constitutes a class 3 misdemeanor. Looking at various state laws and regulations, these can differ; however, as there is no explicit age provided in the references or common nationwide standard, I cannot provide a definitive answer to the specific age question. It's important to note that irresponsibly leaving a loaded firearm where a child can access it is generally against state law and is considered misdemeanor behavior. Different states have different ages under which it is a statutory offense to leave firearms accessible to minors without proper safety measures.
In the information provided, a point of relevance is the maximum penalty prescribed by state law for carrying weapons on public recreational property, which can go up to eleven months and twenty-nine days in jail and a fine not exceeding $2500. The debate on firearms accessibility mentioned is significant because it highlights broader concerns about firearm safety and responsible ownership, particularly regarding the protection of children and the prevention of school shootings.