Why is it necessary to check route, direction and category in hard questions?

Correct answer: Because examples have outgoing contributions and incoming influences separately

The direct answer is C. A difficult contact question may mix a route, a direction and a category. We must separate what moved out from India, what influence came in, and which coast or region was involved. Option A is wrong because the examples are not all spices; goods, ideas and influences can belong to different categories. Option B is wrong because direction matters: western and eastern contacts are not interchangeable. Option C is correct because outgoing contributions, such as traded goods, and incoming influences, such as ideas or techniques, must be distinguished. Option D is wrong because routes did create contact; that is their purpose. The exact method is: identify the item, classify it, locate the route, and check its direction. Exam cue: never choose from a familiar word alone; check all three clues.