In the Northern Heights area, Italian and Slavic pride in

None of these answers is quite GMAT style, but here's my take:

Although the MGMAT approach rightly emphasizes working from splits (differences among the answer choices), sometimes a feature of the original sentence signals a grammatical issue. For instance, parallel markers such as and signal an issue with parallelism, and the good test taker picks that up even before she sees the answer choices. The pronouns it, its, they, them, and their are another sort of signal; when the sentence includes one of these pronouns, you will probably find a problem with pronoun reference.

To what should the pronoun their refer? Italians and Slavs. But In A we find the adjectives Italian and Slavic, rather than the noun Italians and Slavs. Eliminate A.

Let's look at the splits next. What is an obvious difference among the answer choices? Well, there's culture/ cultural. I'm not eager to start with that split, because it looks to signal an issue with concision, and I want to consider grammar and meaning before considering concision.

I don't see any better options, though, so let's start with culture/cultural. I would eliminate only E here, because it uses both, and so is redundant. I think that cultural pride and pride in their culture are precisely the same thing. I mildly prefer the adjective cultural to the noun culture, but I don't think either is really awkward, so I need to look for some other issue. (By the way, a noun/adjective choice could be a choice between two very different meanings; stubborn pride is not pride in their stubbornness. I just don't think that there's any real difference in the present example.)

Among the remaining answers B, C, and D there is a split between pride and the pride. The the is necessary here, so eliminate C.

Finally, between B and D, B misuses the verb conflicts. Conflicts isn't transitive, it doesn't take an object. You can conflict with something, but you can't conflict something directly. Eliminate B.

That leaves D, which according to your note is not the official answer. Could you have misread the answer key? Could you have mistranscribed the question? If that really is the OA, does Magoosh provide an explanation consistent with that OA, or might it just be a typo?