Hi akansha!
The key to understanding this passage and the way that it's working is realize that the last line of the first paragraph is really an introduction to what's to follow in the next two paragraphs. "Nevertheless, the early music approach to performance raises profound and troubling questions." That sets up what is to come and realize that the author is criticizing the "early music approach" which musicians are making.
So by the time we get to the third paragraph, the author's specific example of:
"The discovery that Haydn's and Mozart's symphonies were conducted during their lifetimes by a pianist who played the chords to keep the (40) orchestra together has given rise to early music recordings in which a piano can be heard obtrusively in the foreground, despite evidence indicating that the orchestral piano was virtually inaudible to audiences at eighteenth-century (45) concerts and was dropped as musically unnecessary when a better way to beat time was found."
is meant to highlight that we are not always making "true" recordings of the music as it was heard during Haydn and Mozart's lifetimes. Thus Answer (D) "By making audible the sound of an orchestral piano that was inaudible in eighteenth-century performances, these recordings unwittingly create music that is unlike what eighteenth-century audiences heard" summarizes the author's take on the orchestral piano issue quite well.
But also notice, Answer Options (A), (B), (C) and (E) are trying to get you to make inferences that are not actually there. Do not make undue inferences in the RC section (or anywhere else for that matter) on this test. Answer Choice (A) may be the closest outside of (D) to a viewpoint that is expressed by the author, but note that in (A) the author never goes so far as to say that the " recordings fail to recognize that the last movements of Haydn’s and Mozart’s symphonies were often played slower in the eighteenth century than they are played today." Rather, that
may happen in some recording but it
may not as well. We simply don't know!
Thansk for the great question!