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．Some of the treats can be removed.
B．Young people play a minor role in tipping the police off some accidents.
C．It is found that the attacker is likely to tell his plan beforehand to his peer.
D．It is not difficult to make young people understand why it is in their interest to tattl