The correct answer is letter D. Researchers came to believe that television violence was the reason for almost 10.000 cases of homicide in the USA between the years of 1950 and 1980. Recently, most school homicide cases happen almost at the same time, while it is broadcasted on TV. So the popularity of TV, and also the increase of violent video games, and TV shows that show a lot of violence can affect the violent criminal activity numbers.