GMAT Sentence Correction
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Source: GWD
Level: 3
The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases.
- A achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload
- B achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading
- C how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload
- D how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading
- E how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload