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Bunuel
Becquerel's discovery of radioactivity, and thereby radiometric dating, not only indicated a much older age of the Earth than Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but providing the mechanism of extra heat as well which would keep Earth's core so warm even billions of years after Earth's creation.


A. not only indicated a much older age of the Earth than Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but providing the mechanism of extra heat as well which would keep

B. not only indicated a much older age of the Earth than did Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but also provided the mechanism of extra heat, which keeps

C. not only indicated a much older age of the Earth than Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but also to provide the mechanism of extra heat as well, keeping

D. not only indicated a much older age of the Earth than did Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but providing the mechanism of extra heat which would keep

E. not only indicated a much older age of the Earth than did Lord Kelvin's thermal calculation of a "young Earth," only 20 million years, but provided the mechanism of extra heat as well, keeping

Magoosh Official Explanation:



Split #1a: the GMAT loves the construction “not only ... but also”, but does not like variants, such as “not only ... but”. Choices (A) & (D) & (E) have the latter incorrect form.

Split #1b: the terms connect by the “not only ... but also” construction must be in parallel. All five choices begin with “not only indicated...”, so the parallel term must be “provided”: both “providing” in (A) & (D) and “to provide” in (C) are incorrect.

The only answer that avoids both of these mistakes is (B), the best possible answer.
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