As per the argument, tumors in striped bass is because of two factors, which are Agricultural and Industrial pollution. Although significant steps have been taken to reduce the levels of Industrial pollution in Hudson river, the incidences of tumor have not decreased. Thus it is possible that Industrial pollution is not the reason for the tumor in stripped bass.
Also, it is clear that the argument nowhere mentions that steps have been taken to reduce agricultural pollution.
Now evaluating the options:
...
Also, it is clear that the argument nowhere mentions that steps have been taken to reduce agricultural pollution.
Now evaluating the options:
...



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