Article 21A of the Indian Constitution deals with the Right to Education. This provision was added through the 86th Amendment Act in 2002 and it guarantees free and compulsory education for children between the ages of 6 and 14 years.

Option 1, "Equality before law," is not correct because it is covered under Article 14 of the Constitution which ensures equality before the law for all citizens.

Option 2, "Abolition of untouchability," is not directly related to Article 21A. It is covered under Article 17 which prohibits untouchability and makes it punishable by law.

Option 3, "Abolition of titles," is also not related to Article 21A. The abolishment of titles is covered under Article 18 which prohibits the State from conferring any titles.

Therefore, the correct answer is option 4, "Right to education," which specifically deals with Article 21A of the Indian Constitution.