Which article of Indian Constitution constitutes Abolition of Untouchability?

Article 17

The correct answer is Option 4 - Article 17

Article 17 of the Indian Constitution abolishes untouchability.

Article 17 states: "Untouchability" is abolished and its practice in any form is forbidden. The enforcement of any disability arising out of "Untouchability" shall be an offence punishable in accordance with law.