Correct Option: A

Ajivika (“living” in Sanskrit) was a system of ancient Indian philosophy and an ascetic movement of the Mahajanapada period in the Indian subcontinent. Ajivika was primarily a heterodox Hindu (Nastika) or atheistic system. The Ajivikas may simply have been a more loosely-organized group of wandering ascetics (shramanas or sannyasins). One of their prominent leaders was Makkhali Gosal. Ajivikas are is thought to be contemporaneous to other early Hindu nastika philosophical schools of thought, such as Charvaka, Jainism and Buddhism, and may have preceded the latter two systems.