Assertion: Dr B. R. Ambedkar believed that India should be more friendly with the bloc led by the U.S.
Reason: U.S. bloc claimed to be pro-democracy.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

There were of course parties and groups in the country that believed that India should be more friendly with the bloc led by the US because that bloc claimed to be pro-democracy. Among those who thought along these lines were leaders like Dr. Ambedkar. Some political parties, which were opposed to communism, also wanted India to follow a pro-US foreign policy. These included the Bharatiya Jan Sangh and later the Swatantra Party.