Answer:
A. pesticides and chemicals runoff into waterways
Step-by-step explanation:
Its a fact and so.
In B. pesticides can cause air pollution by releasing harmful gas but does not affect water in anyway.
C. same as B. it does not cause water pollution but more likely to cause air pollution.
In A. when excess pesticides run away because of rain water falling on the soil and reaches to river to cause water pollution.