Respuesta :
Answer: c. an ex post facto law
Explanation:
Ex post facto law retroactively changes the legal results of the acts those were committed in the past before the enactment of the laws being implemented.
The ex post facto law applies to the criminal punishment and may change the punishment for crime. This law applies new penalties and may extend new punishments.
This law will also operate over the disadvantage of accused persons who have committed crime in the past.