The question is about the constitutional amendment in India that restricts the total number of Ministers, including the Prime Minister, in the Council of Ministers to not more than fifteen percent of the total number of members in the house.

Option 1, the 90th amendment, is incorrect because it relates to limiting the reservation of seats for scheduled tribes in Nagaland, Meghalaya, Mizoram, and Arunachal Pradesh legislatures.

Option 2, the 91st amendment, is correct. This amendment, enacted in 2003, added clause (1A) to Article 75 of the constitution. It states that the total number of Ministers, including the Prime Minister in the Council of Ministers, should not exceed fifteen percent of the total number of members of the house.

Option 3, the 92nd amendment, is wrong as it deals with the inclusion of certain languages in the Eighth Schedule of the Constitution.

Option 4, the 93rd amendment, is incorrect as it pertains to providing reservation for admissions in unaided educational institutions for socially and educationally backward classes.