Plant oils
do not represent a new attempt to replace fossil fuels; it was already made by Rudolf Diesel in 1912.
(A) do not represent a new attempt to replace fossil fuels; it
(B) are not a new attempt to replace fossil fuels; the same one
(C) represent not a new attempt to replace fossil fuels, but one that
(D) are not a new attempt to replace fossil fuels, but one that
(E) are not new as an attempt to replace fossil fuels; it
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Meaning is crucial to solve this question. Let's take a look at answer choices.
A - First part doesnt seem to contain any mistake, but what ''it'' refers to? It may refer to '' a new attempt'' . - keep it
B - ''Plant oils are not a new attempt'' - Intended meaning of the sentence has been altered - Illogic meaning. B is out
C- Correctly uses a structure '' not A , but B'' - keep it.
D - The same mistake as in B. D is out.
E - The same mistake as in B. Moreover, the sentence incorrectly uses ''as'' in this context. E is out.
C is our winner . It gives us intended meaning of the sentence that plant oils represent not a new attempt , but an old one which was already made by .....
Hope it helps.