The author mentions the sonatas of Muzio Clementi and the nocturnes of John Field as examples of which one of the following? A. works by composers of the London Pianoforte school that have been preserved in rigorous scholarly editions B. works that are no longer remembered by most people C. works acclaimed by the leaders of the London Pianoforte school D. works by composers of the London Pianoforte school that are relatively well known E. works by composers of the London Pianoforte school that have been revived by Temperley in his anthology