The correct answer is: A. 21st December, 1970.
President’s rule was imposed in Haryana for the first time on 21st December, 1970. The President’s rule was imposed after the dismissal of the Bansi Lal government. The Bansi Lal government was dismissed on charges of corruption and maladministration.
The other options are incorrect.
Option B: 20th March, 1965 is the date on which the state of Haryana was formed.
Option C: 2nd November, 1967 is the date on which the first Assembly elections were held in Haryana.
Option D: 10th April, 1969 is the date on which the first Chief Minister of Haryana, Bansi Lal, was sworn in.