How many years of college were required by the NAC by 1975?

The correct choice reflects that by 1975, the National Advisory Commission on Criminal Justice Standards and Goals (NAC) recommended two years of college education for entry-level law enforcement positions. This recommendation was part of a broader movement during the 1960s and 1970s, which recognized the importance of a more educated police force to effectively address the complexities of modern policing. The push for formal education aimed to enhance critical thinking, problem-solving skills, and the overall professionalism of police officers, making them better equipped to serve their communities.

In this context, the correct choice highlights the shift from a focus solely on physical prowess and basic training to the integration of higher education as a crucial component for law enforcement personnel aimed at improving public safety and community relations.