The trade networks were always created and managed by the powers who most benefited from them (e.g. The European powers with the trade networks in Indochina reagion, in Asia). It usually ended up in genocide and slavery of native communities that inhabited logistic points of interest for the network (not necessarily the starting or end points of the trade), but it would always benefit both ends.
So I believe the best option would be letter a.
The Fugitive Slave Act did not make or cause the US Civil War. The war began in 1861 a full 11 years after the law was passed and Lincoln vowed to enforce it. Therefore, the war and the Fugitive Slave Act are not connected.
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Answer:
The prehistoric site of Mehrgarh in Baluchistan