PT 21 S4 Q3

Musicologists concerned with the London Pianoforte school,...

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) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Art & Literature Mix 1