Final answer:
The subject is about crime trends in the United States and public perception versus actual crime statistics. The correct answer to describe these trends is that both violent and nonviolent crime rates have decreased since the early 1990s, contrary to public belief influenced by media coverage.
Step-by-step explanation:
The question refers to the perceived rates of crime trends in the United States, contrasting public opinion with actual crime statistics.
Despite high levels of media coverage that may influence public perception, violent crime and gun-related crimes have seen a decrease since their peak in the early 1990s.
Surveys have indicated that many U.S. adults believe crime is worse now than in the past, which is not supported by the data showing a decline in violent crime rates. Option a, 'Rates of violent and nonviolent crimes are decreasing,' best describes the crime trends in the United States based on the given information.