Correct option is A
The Bhagavad Gita forms part of the Bhishma Parva of the Mahabharata. It is set in the middle of the great battle of Kurukshetra, where Lord Krishna imparts spiritual wisdom to Arjuna, who is confused and morally troubled about fighting in the war. This 700-verse scripture is one of the most revered texts in Hindu philosophy, providing insights into duty, righteousness, and devotion. The Bhishma Parva also contains the events leading up to the battle and Bhishma's significant role in the conflict.