It can be inferred from the passage as a whole that the author's purpose in the third paragraph is primarily to A. cast doubt on the usefulness of Temperley's study of the London Pianoforte school B. introduce a discussion of the coherency of the London Pianoforte school C. summarize Ringer's argument about the London Pianoforte school D. emphasize the complex nature of the musicological elements shared by members of the London Pianoforte school E. identify the unique contributions made to music by the London Pianoforte school