With regards to ancient history, the areas on this map marked with an "x" all have what in common?
a) none were able to trade over great distances.
b) none lasted out of the ancient era of history.
c) all were protected from invasion by geographic features.
d) all had civilizations that were centered along major rivers.

d) all had civilizations that were centered along major rivers.

explanation:

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a.opium

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