The correct answer is (a) 89th Amendment.
The 89th Amendment to the Constitution of India was enacted in 2003. It inserted a new clause (4A) in Article 75 of the Constitution, which provides that the number of ministers, including the Prime Minister, in the Council of Ministers shall not exceed 15% of the total number of members of the Lok Sabha.
The amendment was made in response to the growing size of the Council of Ministers, which had become unwieldy and inefficient. The amendment was also intended to reduce the cost of governance.
The amendment has been criticized by some for being too restrictive and for limiting the Prime Minister’s ability to choose his or her cabinet. However, the amendment has been praised by others for making the government more efficient and accountable.
The other options are incorrect because they are not the amendments that made it clear that the number of ministers including the Prime Minister shall not exceed 15% of the total strength of Lok Sabha.