Critical Reasoning

PhishCo runs a number of farms in the arid province of Nufa, depending largely on the irrigation. Now, as a part of a plan to efficiently increase the farms' total production, it plans to drill down to an aquifer containing warm, slightly salty water that will be used to raise fish in ponds. The water from the ponds will later be used to supplement piped-in irrigation water for PhishCo's vegetable fields, and the ponds and accompanying vegetation should help reduce the heat in the area of the farms.

Which of the following would, if true, most strongly suggest that the plan, if implemented, would increase the overall efficiency of PhishCo's farms?

A) Most of the vegetation to be placed around the ponds is native to Nufa.

B) Fish raised on PhishCo's farms are likely to be saleable in the nearest urban areas.

C) Organic waste from fish in the pond water will help to fertilize fields where it is used for irrigation.

D) The govt of Nufa will help to arrange loan financing to partially cover the costs of drilling.

E) Ponds will be located on low-lying land now partially occupied by grain crops.

OA:C

Source: OG Verbal Review 2017

simplify the argument first -

Usage of ponds with fish --> Increased efficiency of PhishCo's farms

A - Incorrect. Does not affect the argument that usage of ponds will increase efficiency of phisco's farms.

B - Incorrect.
Does not have any bearing on how usage of ponds would increase efficiency of Phisco's farms.

C - Correct answer.
If organic waste from such ponds are used to fertilize the farms, we can infer that such a thing would lead to more yield and thus increased efficiency.

D - Incorrect.
does not address how the activity would increase farm efficiency.

E - Incorrect.
does not address how this would lead to an increase in efficiency.