Given the results of Experiments 1 and 2, all of the following would reduce the levels of phosphates and nitrates, and therefore the rate of eutrophication, of the lake EXCEPT:
A. decreasing the amount of fertilizer used on the lake golf course.
B. limiting use of pesticides on the farmland on the lake.
C. increasing the number of farms on the lake.
D. installing a filtration system to divert run-off from farmlands and the golf course away from the lake.

Experiment 1
Scientists suspected that one source of nutrients was a feeder stream which intercepts run-off from farmland where pesticides and animal waste are found. Water samples were obtained over several days from that stream (Feeder A) as well as another feeder stream (Feeder B) not near the farm. Results are displayed in Table 1.

Experiment 2
The scientists also surmised that another possible source of harmful nutrients entering the lake was run-off from a golf course adjacent to the lake where fertilizers were applied.
Water samples were obtained from the lake at various distances (0 meters, 100 meters and 200 meters) from the golf course on four successive days, and the levels of chlorophyll, phosphates, and nitrates were measured. The results are depicted in Table 2.

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Day Day 1 Day 2 Day 3 Day 4 Day 1 Day 2 Day 3 Day 4 Phosphate concentration (mg/L) 20.7 13.2 35.6 42.3 Table 1. 10.4 11.5 7.9 10.2 Feeder A Feeder B Nitrate concentration (mg/L) 43.2 44.5 41.6 58.0 13.2 13.4 12.9 11.4