The author suggests that the modern audience's tendency to withhold applause until the end of a symphony's performance is primarily related to which one of the following? A. The replacement of the orchestral piano as a method of keeping the orchestra together. B. A gradual increase since the time of Mozart and Beethoven in audiences' expectations regarding the ability of orchestral musicians. C. A change since the early nineteenth century in audiences' concepts of musical excitement and intensity. D. A more sophisticated appreciation of the structural integrity of the symphony as a piece of music. E. The tendency of orchestral musicians to employ their most brilliant effects in the early.