it punishes for something that was notillegal when it was done.?

Question

a.bill of attainder b.ex post facto law c.writ of habeas corpus d.original jurisdiction

Answer 1

(b) is the best answer.

It is incomplete because an ex post facto law also includes one that increases the penalty on some act that was illegal when it happened.

Answer 2

An ex post facto law is a law that retroactively changes the legal consequences of acts committed or the legal status of facts and relationships that existed prior to the enactment of the law. In reference to criminal law, it may criminalize actions that were legal when committed.

In the US, ex post facto laws are illegal.

-Saffyre

Answer 3

'B'.................