punishing someone for an action that did not used to be a crime is an example of\nan ex post facto…

punishing someone for an action that did not used to be a crime is an example of\nan ex post facto law.\nhabeas corpus.\na \necessary and proper\ law.\na bill of attainder.

punishing someone for an action that did not used to be a crime is an example of\nan ex post facto law.\nhabeas corpus.\na \necessary and proper\ law.\na bill of attainder.

Answer

Brief Explanations:

An ex - post - facto law punishes someone for an act that was not a crime when committed. Habeas corpus is a legal remedy related to unlawful detention. A "necessary and proper" law is a power - granting clause in the US Constitution. A bill of attainder is a legislative act that punishes a person or group without a judicial trial.

Answer:

A. an ex post facto law.