What Do Researchers Mean They Say That Homicide Tends to Be

What do researchers mean they say that homicide tends to be an "intraracial" event?

A) the victim and the offender are of different ages
B) the victim and the offender are of similar ages
C) the victim and the offender are members of different races
D) the victim and the offender are members of the same race
E) the victim and the offender come from the same urban area