Anekāntavāda is a core theory and philosophy of which one of the following?

The correct answer is Jainism because Anekantavada is one of the most important and fundamental doctrines of Jain philosophy. It refers to the theory of plurality of viewpoints or many-sidedness of reality. According to this principle, truth and reality are complex and have multiple aspects. No single human view can represent the absolute truth entirely. This philosophy encourages tolerance and the understanding that different perspectives can all contain a portion of the truth. It is closely related to the concepts of Syadvada (the theory of conditioned predication) and Nayavada (the theory of partial viewpoints). While Buddhism follows the Middle Path and various schools of Hindu philosophy have their own metaphysical views, the specific term Anekantavada is unique to Jainism.