The Main Point of the Story of the Kyle Unger

The main point of the story of the Kyle Unger Manitoba murder case was that:

A) after serving 14 years on a conviction that was overturned, a case cannot be retried.
B) acquittals may not result in wrongful conviction compensation if the case had a confession.
C) false testing of trace evidence may result in expensive wrongful conviction compensation.
D) cases may be overturned if police engage in an undercover sting to get a confession.