A
Ex-post Facto Law
B
Doctrine of Pith and Substance
C
Principle of Natural Justice
D
Eminent Domain
Correct answer: (a) Ex-post Facto Law
Explanation
Option A is correct because an ex-post facto law is a law that criminalizes an action retroactively after it was committed, which is prohibited under Article 20(1). The other terms refer to completely different legal doctrines.
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