Answer: Without a list of the statements to choose from, I cannot accurately identify the best statement that reflects Blumstein and Rosenfeld's conclusion about local crime rate trends in America. However, Blumstein and Rosenfeld are well-known criminologists who have conducted extensive research on crime trends in the United States. Their work has suggested that crime rates have generally declined in the US over the past few decades, although the extent of the decline varies by location and type of crime. They have also highlighted the importance of understanding the underlying causes of crime in order to develop effective crime prevention strategies.