The correct answer is A. Nirgranthas.
Nirgranthas were the original followers of Mahavira, the 24th Tirthankara of Jainism. The word “Nirgrantha” means “one who is free from bonds”. The Nirgranthas were a group of ascetics who renounced all worldly possessions and lived a life of poverty and simplicity. They were also known for their strict adherence to the principle of ahimsa, or non-violence.
The Nirgranthas were a major force in Indian society for centuries. However, their numbers declined in the 12th century, and they are now a small minority in India.
The other options are incorrect. Sugranthas were a group of Jains who followed the teachings of Sudharma Swami, a disciple of Mahavira. Yogaranthas were a group of Jains who followed the teachings of Yogacharya, a disciple of Mahavira. None of these groups were the original followers of Mahavira.