Hindi Diwas is observed on 14 September because on that day in 1949 the Constituent Assembly:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → adopted Hindi in the Devanagari script as the official language of the Union
On 14 September 1949 the Constituent Assembly adopted Hindi in the Devanagari script as the official language of the Union (now Article 343). The Constitution names no national language; the anthem was adopted and the Constitution signed on 24 January 1950.