GMAT Sentence Correction (SC) | Not only speech enables man to handle and pass on more complicated ide

The question stem usesnot only ... (but) also . Possible ways it can be used:

1. Speech enables man to not only handle and pass on more complicated ideas but also accumulate them.

2. Not only does speech enable man to handle and pass on more complicated ideas, it also enables him to accumulate them.

Note that in 2 after "not only" a question form, i.e, auxiliary + subject
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