How do you understand the word "mayhem" in paragraph 1

A．Charles Williams had tried to prevent his son from the killing
B．Charles Andrew kept his scheme to shoot as a top secret
C．people who had the clue of the killing did not take Andrew’s words seriously except two
D．some of Andrew’s classmates found a revolver in his backpack

A．Andy Williams' parents’divorce has some negative effects on him.
B．Andy Williams was rather popular because he used to be quite friendly.
C．Anti-bullying policies are adopted by all schools in Colorado.
D．Silence is strongly banned in schools.