The Kamraj Plan was a plan formulated in 1963 by the then Chief Minister of Madras, K. Kamaraj. The plan was aimed at rejuvenating the Indian National Congress, which was experiencing a decline in popularity and organizational strength.

Option 1 is incorrect. The Kamraj Plan did not involve proposing a new constitution for the Indian National Congress.

Option 3 is incorrect. The Kamraj Plan did not propose a new set of principles for accepting donations for the party work.

Option 4 is incorrect. The Kamraj Plan was not specifically focused on rooting out corruption from India as a whole.

The correct answer, option 2, states that the Kamraj Plan involved asking senior ministers to leave the government and work to rejuvenate the party. This is an accurate description of the plan. Kamaraj believed that by removing experienced and influential leaders from their government positions, they could dedicate their efforts towards strengthening the party at the grassroots level and connect with the masses. This decision was seen as a way to promote new leadership and create opportunities for younger politicians within the party.