What years are associated with the era when law enforcement personnel were known by the citizens in their working areas?

The correct choice corresponds to the era from 1900 to 1940, during which law enforcement personnel, often referred to as "beat officers" or "community officers," had a strong presence in neighborhoods and were known by the citizens they served. This period is characterized by a policing style that emphasized community relations and local engagement. Officers patrolled specific areas regularly, fostering relationships with community members.

This connection between law enforcement and the community was significant as it helped in building trust and communication, enabling officers to gather information and reduce crime through cooperative relationships. The focus was often on maintaining order and a sense of safety through familiar and approachable officers rather than the more formal or distant approach that developed in later policing eras.

The other timeframes mentioned typically reflect shifts toward more centralized policing strategies and the introduction of technology and new policing methods, which often led to a decrease in community interactions in the same manner as seen in the early 20th century.