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.
Answer: His main reason to travel was to go on a Hajj, or a Pilgrimage to Mecca, to fulfill the fifth pillar of Islam.. But his traveling went on for around 29 years and he covered about 75,000 miles visiting the equivalent of 44 modern countries which were then mostly under the governments of Muslim leaders of the World.
Explanation: hope it helps!
What battle is it talking about?