I don't understand they dont have same effect both groups dont go to the doctor less only the group with the book and the other doctor visit rate has no change

I dont understand this question because it says "Failure to rotate crops means nutrients will deplete and then you have add fertilizer to keep growing." Then question tell us no "fertilizer has been added" wouldnt that mean crops were rotated properly. And it didnt tell us the crop wasnt rotated properly so that should mean they could have been rotated or not.

Then D should be correct answer C feels like it Could Be True because we dont know if the crops were rotated or not. We know that fertilizer wasnt applied and conditionally there was no use of pesticides because pesticides are applied if fertilizer is applied. So it must be true any bad health effects dosent come from the pestcides because there was no fertilizer applied.

Im interested in it