Option(D) is correct
Option A : The logic of the prediction has nothing to do with whether the current can be turned on and off; rather, it is concerned with the current itself and its
effects.
Option B : Rather than suggesting that the logic of the prediction is flawed, this serves to support the prediction: Farmers saving on chemicals would be part of the
predicted agricultural revolution.
Option C : The argument does not take for granted that the use of electricity is always beneficial; it merely suggests that it would be of great benefit to agriculture.
Option D : Correct. This statement properly identifies a problem with the prediction: It provides no reason to believe that the electricity would affect crop plants and
weeds differently.
Option E : Rather than suggesting that the logic of the prediction is flawed, this serves to support the prediction: Changes in planting machines would be part of the
predicted agricultural revolution.