Exactly right ivankrasnov88!
For future readers, let's just look at the purpose of the 3rd paragraph and the incorrect answers. As ivankrasnov88 said...
ivankrasnov88 Wrote:The musicological elements weren't shared nearly as much as the geographical location was.
So the author is calling into question how stylistically similar the members of the London Pianoforte school actually were - essentially this represents a lack of stylistic coherency - best expressed in answer choice (B).
Let's look at the incorrect answers:
(A) places the author on the wrong side of the issue. The author is impressed with Temperley's study of the London Pianoforte school.
(C) was not introduced until the 4th paragraph.
(D) states the opposite of what is hinted at in the 3rd paragraph as ivankrasnov88 pointed out.
(E) is close (sort of). While the contributions were unique (if you take that to mean different from each other), those contributions were not identified in the 3rd paragraph.
Hope that helps!