Answer: In this case,from the given comprehension we are required to improve the efficiency of PhishCo's farms. Since, we are given that PhishCo runs a number of farms depending largely on the irrigation.
Also in order to increase efficiency and production, it plans to drill down to an aquifer containing warm, slightly salty water that will be used to raise fish in ponds. Further using this water to irrigate vegetable fields.
Therefore, from the given options, it can be clearly stated that Organic waste from fish in the pond water will help to fertilize fields where it is used for irrigation, thus increasing the overall efficiency.
i.e. Option (c) most strongly suggest that the plan, if implemented, would increase the overall efficiency of PhishCo's farms