(A) in 1802 created the first prototype of the lightbulb, that was
(B) made the first prototype in 1802, but it was
(C) had created in 1802 the first prototype of the lightbulb, although this would be
(D) had created the 1802 prototype, the first one, which had been
(E) in 1802 had made the first prototype, but this would be
The past perfect tense is one way to indicate that one past event happened before another. When is it necessary? permitted? redundant? For a discussion of these issues, as well as the OA & OE for this particular question, see:
Past Perfect on GMAT Sentence Correction
Mike
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