According to paragraph 3, which of the following is NOT true of the technological and aesthetic experiments of the 1920's? A. Because the costs of introducing recorded sound were low, it was the only innovation that was put to use in the 1920's. B. The introduction of recorded sound prevented the development of other technological innovations in the 1920's. C. The new technological and aesthetic developments of the 1920s included the use of color, new screen formats, and television. D. Many of the innovations developed in the 1920s were not widely introduced until as late as the 1950's.