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The options given relate to the reasons for road transport receiving maximum impetus in India post-independence.
Option 1 includes I, II, and III, but III is incorrect because the per unit cost of transportation is actually cheaper in rail transport than in road transport.
Option 2, the correct answer, includes I, II, and IV. I is a valid reason due to the high capital costs of railways. II also holds as the vast geographic spread of human settlements cannot be solely served by railways. IV explains the convenience factor - private vehicles are often more easily accessible and convenient than railways.
Option 3 includes I, III, and IV. However, as already mentioned, III is incorrect as rail transport is cheaper per unit than road transport.
Option 4, which includes II, III, and IV, is incorrect due to III`s incorrect assertion about costs.