Which option wrongly interchanges goods and ideas in India-world relations?

Correct answer: Spices are philosophical ideas and Upanishads are trade goods

The direct answer is C. Spices are physical trade goods, whereas the Upanishads are associated with philosophical and spiritual ideas. Option A is correctly paired: spices are goods and the Upanishads are ideas or teachings. Option B is also correctly classified: muslin is a textile traded as a good, and the decimal system is a knowledge contribution. Option C reverses the categories. Spices are not philosophical ideas; they are material products used and exchanged. The Upanishads are not trade goods; they are texts containing philosophical and spiritual thought. Option D is correctly classified because the Panchatantra represents literary transmission and Indian numerals represent a mathematical or knowledge contribution. Therefore C is the only wrong interchange. Exam cue: ask whether the item can be physically traded or whether it communicates thought or knowledge.