The spread of Upanishadic ideas outside India is an example of what?

Correct answer: Exchange of ideas

The Upanishads contain philosophical and spiritual ideas that became known beyond the region where they originated. When such ideas move between societies through teaching, discussion, translation, travel, or study, this is called an exchange or spread of ideas. It is different from the movement of only physical goods. The example shows that links between India and other regions included intellectual and cultural communication.

Option C is correct because it directly describes the exchange of ideas. The Upanishadic example concerns knowledge, thought, and philosophy, not sea fish, a boundary dispute, or trade in goods alone. Option A is too narrow because cultural contact can include beliefs and learning as well as commodities. Thus, the historical point is that ideas can travel across regions and influence people outside their original cultural setting.