Which categorisation strategy is safest at expert level?

Correct answer: Keep routes trade knowledge religion literature and external influence separate

Direct answer: Option A is correct. Expert categorisation is safest when related examples are separated into clear categories instead of being placed in one vague group. First identify the route or channel. Then ask what moved through it: goods and trade, knowledge, religion, literature, technology or architectural ideas. Finally connect each example with its specific role. Option A is correct because it keeps routes, trade, knowledge, religion, literature and external influence distinct while still allowing them to be studied together. Option B is wrong because not every example is a spice; spices are only one kind of traded good. Option C is wrong because Indian history involved both incoming influences and influences moving outward from India; all contact was not one-way. Option D is wrong because “polar” does not describe ordinary land and maritime contact in this topic. The safe method is classification by function, not by an unrelated label. Memory cue: ask “what moved, through which route, and what effect did it have?”