GMAT Sentence Correction (SC) | Re: While it costs about the same to run nuclear plants as other

this question is most difficult of comparison.

if the full sentence is wrong, we can find the error. if the elliptical sentence is wrong, it is harder to find the error. but we need to write this sentence and gmat tests us.

While it costs about the same THING to run nuclear plants as THE THING other types of power plants COSTS

clearly this is wrong. not logic, not parallel

While the cost of running nuclear plants is about the same as THE COST OF RUNNING for other types of power plants

this