Among the Factors That Influence Delinquency Rate Trends,which Is False

Among the factors that influence delinquency rate trends,which is false?

A) The general crime rate follows the proportion of young males in the population.
B) As the number of gun-carrying (toting seems too informal) students increases,so does the seriousness of violent delinquency.
C) As the level of social problems increases,such as unwed mothers and racial conflict,so do delinquency rates.
D) There is strong association between delinquency rates and the immigrant population.