The voluminous personal papers of Thomas Alva Edison reveal that his inventions typically sprang to life not in a flash of inspiration but evolved slowly from previous works.
The not .... but .... shows contrast. They should be parallel.
=> not X but Y : X and Y should be ||.
In original sentence:
X : in a flash of inspiration ( PP )
Y : evolved ( V )
Correct option :
did not spring to life in a flash of inspiration but evolved slowly
X: spring (V)
Y: evolve (V)
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