In the second paragraph, the author discusses Beethoven's first piano concerto primarily in order to A. Illustrate how piano music began to change in response to the extended range of pianos that became available during Beethoven's lifetime. B. Illustrate how Beethoven's work failed to anticipate the changes in the design of instruments that were about to be made during his lifetime. C. Suggest that early music advocates commonly perform music using scores that do not reflect revisions made to the music years after it was originally composed. D. Illustrate how composers like Beethoven sometimes composed music that called for notes that could not be played on instruments that were currently available. E. Provide an example of a piano composition that is especially amenable to being played on piano available at the time the music was composed.