Explanation:

- Article 20 of the Indian Constitution provides protection in respect of conviction for offences. It includes the principle of double jeopardy, which ensures that no person shall be prosecuted and punished for the same offence more than once. This is a safeguard against abuse of legal power.

- Article 18 relates to the abolition of titles, except military and academic distinctions. It prohibits the State from conferring any titles and citizens from accepting any titles from a foreign State.

- Article 28 prohibits religious instruction in any educational institution wholly maintained out of State funds.

- Article 21A refers to the right to education and mandates the State to provide free and compulsory education to all children aged six to fourteen years.

The correct answer is Article 20.