Mahavira’s first disciple was Jamali. It is important to note that Jamali was the first disciple of Mahavira after he attained enlightenment. While Bhadrabahu and Sthulabhadra are prominent disciples of Mahavira, they were not his first disciples. Charvaka, on the other hand, was a philosopher and materialist who belonged to a different school of thought altogether, and he cannot be considered a disciple of Mahavira. Therefore, the correct answer is option 4, Jamali.