Final answer:
Location C, which has recycled wastewater from a power plant, is likely the lowest cost option for obtaining water for crop irrigation on a farm, assuming proper treatment for agricultural use. This option balances cost effectiveness and sustainability, aligning with current trends in water resource management.
Step-by-step explanation:
If a farm is in need of fresh water for its crops, evaluating the different locations for water supply with respect to cost requires considering the treatment and transportation costs associated with each option. Location A is contaminated with mining chemicals and would require expensive treatment to make the water safe for crop irrigation. Location B is a desalination plant, which also typically entails high energy and financial costs due to the process of removing salt from seawater. Location C involves recycled wastewater from a power plant, which could be a cost-effective option if the wastewater is treated adequately for agricultural use. Location D involves irrigation from a high-leveled aquifer. While groundwater sources can be reliable and of good quality, especially if they are deep and confined, the process of drilling and pumping could be expensive, especially if overuse requires wells to be dug deeper over time.
Considering the sustainability issues and potential expenses, Location C appears to be the most cost-effective source, assuming that the wastewater undergoes proper treatment to be safe for crop irrigation. Utilizing recycled water can be part of a sustainable farming practice and represents a growing trend in conserving freshwater resources.