Help me plzzzzz

Which plot description is the best example of a tragedy?
O
A. An old man must give up his most prized possession - his car
- to raise enough money to send his granddaughter to school.
O
B. An arrogant businessman loses his money and his freedom when
he is sent to jail after his auto company fails to do proper safety
inspections.
C. A teenage couple is split apart when the young boy's father is
transferred to a new position and the boy's family must move
away.
D. An environmental activist struggles to save a historical landmark,
only to see the building destroyed in a fire.