The argument that is most valid about the fortification of Jericho is that it was a promotion of a powerful merchant class, as explained below.
Jericho was a Palestinian town, most famous for being mentioned in the Bible. Most likely founded around 9000 BCE, Jericho started as a settlement. Soon, agriculture was developed, probably through the use of irrigation.
As time went by, Jericho likely became a city of merchants or traders. With a grain surplus, they built fortifications to maintain their production safe. The accumulated grain could then be traded with people from other places.
With the information above in mind, we can say that the argument that is most valid about the fortification of Jericho is that it was a promotion of a powerful merchant class.
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