Jain philosophy's spiritual ideas are said to be inspired by which school of philosophy?

Standard comparative accounts note parallels between Jain and Sankhya thought, including non-theistic reasoning, liberation through knowledge and a distinction between conscious selves and material reality. This should be understood as philosophical similarity, not a proven claim that Jainism simply borrowed all spiritual ideas from Sankhya. Hence the remaining options do not match the specific Jain doctrine, person, place, title or chronological context asked in the question.