Which of the Following Statements About Mass Murderers and Serial

Which of the following statements about mass murderers and serial killers is FALSE?

A) Mass murders are those in which four or more people are killed by the same person.
B) The case of Dennis Rader is a reminder of society's vulnerability to terroristic acts,whether motivated by ideology or committed by psychotic individuals.
C) Although the number of mass murders and serial killings fluctuate from year to year,some of the worst cases occurred after 1980.
D) The mentally ill commit murder at the same rate as the general population,but serial killers are seldom psychotic.
E) None of the above.