According to Article _______________ of the Constitution of India, a person cannot be held guilty of an act which was not a crime at the time of its commission.​

Correct option is C

The correct answer is (c) 20 ​

Explanation: 

• According to Article 20 of the Constitution of India, a person cannot be held guilty of an act that was not a crime at the time of its commission.
• This is an essential provision that ensures the principle of "nullum crimen sine lege", which means "no crime without law." Essentially, a person cannot be punished for an act that was not criminal at the time it was committed.

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Article 20 of the Constitution of India:

Article 20 deals with Protection in Respect of Conviction for Offences and provides the following safeguards:

1. No Ex Post Facto Law (Clause 1):

   • This provision ensures that no one can be punished for an act that was not a crime at the time it was committed.
   • Ex post facto law refers to laws that criminalize actions that were legal at the time they were done, which is prohibited under this article.

2. Protection Against Double Jeopardy (Clause 2):

   • A person who has been acquitted or convicted by a court of law cannot be tried again for the same offense.
   • This principle prevents a person from being prosecuted twice for the same crime (also known as double jeopardy).

3. Protection Against Self-Incrimination (Clause 3):

   • No person accused of an offense can be compelled to be a witness against themselves.
   • This protects individuals from being forced to testify or produce evidence that could be used to incriminate them.