How does agriculture cause water pollution?
A. pesticides and chemicals runoff into
waterways
B. pesticides are released into the air
C. burning crops release pollutants into the
air

A. pesticides and chemicals runoff into waterways

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.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.