What are the three main requirements to legally own a gun according to current laws?

The correct answer identifies three critical elements for legally owning a gun, which align with many current laws in various jurisdictions. Firstly, the age requirement of 18 years old is significant as it is the minimum age set by federal law in the United States for purchasing rifles and shotguns. Secondly, obtaining a license or permit is often mandated in many states, serving as a way to regulate firearm ownership and ensure that individuals possess the necessary knowledge and responsibility associated with gun ownership. Lastly, the stipulation of having no criminal record or mental illness is crucial for public safety. Many states and federal laws prohibit individuals with certain legal or psychological disqualifications from owning firearms, reinforcing the importance of responsible ownership and minimizing risks associated with gun violence.

The other choices listed do not accurately reflect commonly accepted legal requirements for firearm ownership. For example, requiring an age of 21 years for general gun ownership is stricter than federal law, which, as mentioned, allows for ownership of certain firearms beginning at age 18. Additionally, the focus on hunting licenses or specific mental health evaluations in other options presents a narrower scope compared to the broader requirements recognized under many regulations.