Which Answer Choice Describes the Difference Between Mass Murder and Serial

Multiple Choice

Which answer choice describes the difference between mass murder and serial murder?

A) Mass murder involves at least five victims, where serial murder involves victims or less.
B) Mass murder involves victims that are known to the perpetrator where serial murder involves unknown victims.
C) Serial murder involves a sexual component, whereas mass murder does not.
D) Serial murder involves a cooling off period, where mass murder does not.