When may citations be issued?

The correct choice highlights that citations may be issued when an officer deems it appropriate, following the explanation of the violation to the individual involved. This emphasizes the officer's discretion and responsibility to ensure clarity regarding the reason for the citation. When an officer explains the violation, it helps ensure that the individual understands the context and rationale for the enforcement action, which can foster better compliance and educate the public about the law.

In this scenario, the focus is not solely on the presence of a supervisor, thorough investigation, or complaints from the public, but rather on the officer's authority and judgment in the situation. The option that highlights the officer's discretion and the communication of the violation aligns better with the principles of policing and community relations, fostering transparency and understanding between law enforcement and the public.