You Are "Living Off the Grid" Meaning That You Are

You are "living off the grid" meaning that you are not using any public utilities: no water supply, sewer connection, natural gas, or electricity. You do have a septic tank, whose pipe carries sewage underground where it is released over a wide area, the leaching ?eld. There is also a small pond out there that you have stocked with ?sh. However, you notice that the ?sh are ?oating dead in the water, and the pond has a green scum on it. What happened?

A) Chemical toxins from your septic tank cleaner have killed the ?sh.
B) There are not enough nutrients in the water, so the ?sh died.
C) The ?sh died due to a lack of calcium, which then caused the algae to overgrow.
D) There is oxygen depletion in the pond due to the leakage of phosphates and other compounds from your septic tank.