there are three farms (A, B, and C) that are on three different rivers that feed into the towns reservoir, Lake Ruby. What data would support the claim that farm A and not farm B or C is responsible for the fertilizer in the reservoir?

The analysis of water.

Explanation:

The data of stream that comes from the farm A is the claim that provided evidence that farm A is responsible for the fertilizer in the reservoir because the analysis of the data shows that there is fertilizer present in the water that comes from farm A to the reservoir. This fertilizer comes in the water due to the application of fertilizer on the field, if the fertilizer is not used on the field, there is no traces of fertilizer in the water of reservoir.