What does a guard company primarily prevent?

A guard company primarily focuses on maintaining security and safety on private property. This includes preventing unauthorized entry, which helps deter potential larceny or theft as well as vandalism, where property may be damaged intentionally. The presence of security personnel acts as a deterrent to individuals who might otherwise consider committing such acts.

While options like preventing unauthorized access to a website or the sale of illegal items might be relevant in certain contexts, they do not align with the primary role of a guard company, which is physical security on premises. Similarly, addressing noise violations pertains more to local regulations and community relations rather than security services. Therefore, the correct answer highlights the core responsibilities of a guard company in protecting private property from these specific threats.