I believe the answer is B.
A/C/D: All of these answers are positive effects, of human water use.
By process of elimination it must be (B) Also the run off is basically stripping the soil of the nutrients a farmer would need to grow crops, so this is incredibly bad - but a problem easily fixed.
Answer:
Yes it's right I am here to help you
comer sano y llevar un horario de ejercicio diaro