Which of These Is an Example of the Sunk-Cost Effect

Multiple Choice

Which of these is an example of the sunk-cost effect?

A) Sally is too sick to go out,but decides to attend the play since she paid $40 for the ticket.
B) Jenny relents to the high-pressure sales person and spends $550 on accessories she doesn't need.
C) Despite continued losses,Tony continues to play the ponies at the local track.
D) Aaron has a decent seat for the basketball game,but decides to upgrade them by buying much better seats