Edward not only resists learning to correlate new facts but also remem

"...not only X but also Y..." is the most common phrase idiom tested on the GMAT. There are two things to immediately consider when you see this construction in a sentence. First, the idiom itself must be in tact. In other words, "not only" must always be paired with "but also" without interruption. It would be incorrect, for example, to say: "I not only like ice cream, but I also like brownies." It's close, but the "but also" part is broken up in the second half of the sentence. We want "but also" together. Second, the X and Y part of the idiom must be expressed in parallel. In this example, we immediately notice that X ("resists") is not parallel with Y ("remembering") so something has to change. Eliminate answer choice A. Now a lot of times on the GMAT, one part of the idiom is in the underlined part of the sentence while the other is not. In those cases, the un-underlined portion dictates what must change in the underlined portion. Here, however, both parts are in the underlined portion of the sentence so you have some liberty as to how to resolve the sentence. It's tempting to stick with "not only" coming before "resists" since that's how it is in the original sentence, but that's not necessary. It's more important that X and Y are parallel. Only answer choice C has that part correct, so that's the right answer.