Welcome to the non-lurking world
, and thanks for a great question!
Let me give one piece of general advice, and then some specific guidance on this question. If you think an answer choice is obvious (or obviously right), scrutinize it just a bit (make sure you're not missing anything about its language that would make it wrong), but feel comfortable picking it! The test isn't always trying to "hide the ball" from you. And definitely don't pick a different answer unless
you see two things: one, a reason why the answer you picked is definitely wrong; and two, a reason why the answer you're considering switching to is much better
than your first answer. Without those two things, stick with your gut!
Regarding the specifics of the question, you're on the right track by singling out whether the answer should be a "literal" reflection of what that portion of the passage says, or the "intention" of the author in including the quote. The question stem asks us what the author includes this phrase "in order to" do. That "in order to" is a reference to the author's purpose, or intention. And authors' intentions many times differ from the literal meaning of the words they're using. In this case, the author is being sneaky with the Kotzebue quote, trying to get us to think more deeply about Schoenberg by showing us how some people felt originally about Beethoven (a composer most people now acknowledge as one of the greats). So go with the non-literal description in answer choice D, which also fits the author's
attitude of respect and admiration for both Beethoven and Schoenberg.
I hope this helps!