PT 21 S4 Q4

Musicologists concerned with the London Pianoforte school,...

Which one of the following, if true, would most clearly undermine a portion of Ringer's argument as the argument is described in the passage?
(A) Musicians in Austria composed innovative music for the Broadwood piano as soon as the instrument became available.
(B) ...
(C) ...
(D) ...
(E) ...

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