The correct answer is D. 1914-15 AD.
The Mandi Conspiracy was a plot by Indian nationalists to overthrow the British Raj in India. It was organized by the Ghadar Party, which was founded in 1913 in San Francisco, California. The party’s goal was to overthrow British rule in India through armed revolution.
The Mandi Conspiracy was planned in Mandi, a town in the Indian state of Himachal Pradesh. The conspirators planned to assassinate the British Viceroy, Lord Hardinge, and to launch a general uprising against the British. However, the plot was discovered by the British authorities, and the conspirators were arrested.
The Mandi Conspiracy was a major setback for the Ghadar Party. However, the party continued to operate, and it played a significant role in the Indian independence movement.
The other options are incorrect because they are not the years in which the Mandi Conspiracy took place.