The constitution forbids congress from select one: a. proposing constitutional amendments. b. passing ex post facto laws. c. declaring war. d. proposing the repeal of constitutional amendments. e. creating a national university.

The correct answer is b. passing ex post facto laws.

Ex post facto laws are those that retroactively change the rules of evidence in a criminal case and increase the punishment of a crime that was legal when committed. This is a violation of Article 1 Section 10 clause 1 of the constitution

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