You will find it fun by seeing your progress, Future JD27!

Due to the language barrier (I am not a native English speaker) I could not figure out what (D) exactly mean when I solve this problem, but now I can see how subtle but clear the difference between the answer and the beit. We have to be extremely careful which choice is precisely conveying the meaning of passage, as the word "unwarranted" seems adding subjective view toward the passage.

I was wondering why I got wrong with (e) will not produce a net reduction in environmental degradation, but now it is clear. We have to find the undertone which author want to deliver, that he wants to convince us electric cars may have worse environmental effect than those proponents believe. Hmm, interesting!