Army Day is celebrated on the 15th of January.
International Yoga day is celebrated on the 21st of June.
National Integration day is celebrated on the 19th of November on the birth anniversary of Indira Gandhi.
National Science Day is celebrated on the 28th of February to commemorate the discovery of Raman effect by Sir C.V.Raman.
Sadbhavana Divas is celebrated on the 20th of August.
Therefore, option D is the right answer.
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