D They were located in the middle of major routes between different regions.
Explanation:
Trade had always existed between Europe and Asia, and the Middle East was where the trade routes would inevitably have to pass through. The middle passage of many trade routes such as the Silk Road had to pass directly through middle eastern kingdoms.
We might never find out, but what is amazing about helots is that there were seven of them per a single Spartan. You heard it right, seven slaves per a single free citizen.
