After learning about your local water supply, you decide you want to start doing some research. You decide to measure the phosphate levels of your local pond every week and record the results.

The BEST reason to carry out this process is

A) to make sure that the pH levels in the pond are not too low.
B)to make sure you have a record of the changes in turbidity in the pond.
C) to make sure that the dissolved oxygen levels in the pond are not too high.