The correct answer is (b).
The Balwant Rai Mehta Committee was set up in 1957 to study the working of the Community Development Programme and National Extension Service. The Committee recommended a three-tier Panchayati Raj System with elected representatives at the village, block and district levels. The Committee also recommended that the Panchayati Raj institutions should be entrusted with a wide range of functions, including agriculture, education, health, rural development and social welfare.
The Ashok Mehta Committee was set up in 1977 to review the working of the Panchayati Raj System. The Committee recommended a number of reforms, including the strengthening of the Panchayati Raj institutions, devolution of powers and resources to them, and making them more accountable to the people.
The G. K.V. Rao Committee was set up in 1985 to review the implementation of the recommendations of the Ashok Mehta Committee. The Committee recommended a number of measures to strengthen the Panchayati Raj institutions, including the amendment of the Constitution to provide for a Constitutional status for the Panchayati Raj institutions.
The L.M. Singhvi Committee was set up in 1993 to review the working of the Panchayati Raj System. The Committee recommended a number of reforms, including the strengthening of the Panchayati Raj institutions, devolution of powers and resources to them, and making them more accountable to the people.