Emperor Chandragupta Maurya followed Hinduism for major part of his life. He embraced Jainism after retiring. At an older age, Chandragupta renounced his throne and material possessions to join a wandering group of Jain monks. Chandragupta was a disciple of Acharya Bhadrabahu. It is said that in his last days, he observed the rigorous but self-purifying Jain ritual of santhara, i.e. fast unto death, at Shravana Belgola in Karnataka. Hence, the correct option is 3.