How does the polygraph work

A．He should have made an appointment.
B．He should have called to cancel his appointment.
C．He should have come for his appointment.
D．He should have stayed at home until he was well.

A．person should probably be the least afraid of a dwarf shark.
B．A person should probably be the least afraid of a tiger shark.
C．A person should probably be the least afraid of a bull shark.
D．A person should probably be the least afraid of a great white shark.