Answer: A. Persian Wheel
Explanation:
A Persian wheel would be best because it is able to satisfy the demands of individual users as opposed to groups. A Persian wheel uses a single well to draw water so would be able to supply a person or people in a deserted area by drawing from individual wells.
Canals and dams on the other hand are best for areas with a lot of people as they would all benefit from the canal supplying multiple farms which would offset the cost of building it in the first place. Building a canal to a single farm is not feasible if it was to supply a single farm.
