19th December 1961
19th August 1971
19th July 1991
19th July 1981
Answer is Wrong!
Answer is Right!
The correct answer is A. 19th December 1961.
The Portuguese left Goa on 19th December 1961, after being invaded by Indian forces. The invasion was a result of years of tension between India and Portugal over the Portuguese colonial possessions in India. The invasion was successful, and Goa was integrated into India.
The other options are incorrect. Option B is the date of the Indo-Pakistani War of 1971. Option C is the date of the collapse of the Soviet Union. Option D is the date of the assassination of Indira Gandhi.