The Upanishads are mainly related to which subject?

Philosophical inquiry about Atman and Brahman

The governing concept is the philosophical and spiritual inquiry found in the later Vedic texts. The Upanishads discuss questions about the self, ultimate reality, knowledge, death, rebirth and liberation. Two recurring ideas are Atman, often referring to the inner self, and Brahman, the ultimate reality; many Upanishadic teachings explore their relationship. Therefore option D is correct. Urban planning, maritime trade and coin making are important subjects in other areas of ancient history, but they do not define the purpose or content of the Upanishads. The texts are not simply records of rituals or political events; they emphasise dialogue, reflection and the search for spiritual knowledge. This shift toward philosophical speculation is why they are closely associated with Vedanta and Indian philosophical traditions.

This is a Class 10 General Knowledge question. Chapter: Indian History. Topic: Ancient Indian History.