Sentence Correction

Over 75 percent of the energy produced in France derives from nuclear power,
while in Germany it is just over 33 percent.

energy produced in France is being compared here.
It here refers to energy produced from nuclear power. This is called as an empty it.

(A) while in Germany it is just over 33 percent

(B) compared to Germany, which uses just over 33 percent
Energy produced is compared to Germany
Germany, which … is incorrect

(C) whereas nuclear power accounts for just over 33 percent of the energy produced in Germany
This is precise and correct.
(D) whereas just over 33 percent of the energy comes from nuclear power in Germany

“the energy” seems to refer back to “the energy produced in France.” So now the sentence says “whereas just over 33 percent of the energy {produced in France} comes from nuclear power in Germany.” And that doesn’t make sense. Tricky! Eliminate (D).
(E) compared with the energy from nuclear power in Germany, where it is just over 33 percent
It pronoun here is incorrect and is called an empty it.