Which of the following statements is not true?A. Tchaikovsky's progress in music was so rapid that after graduating from the St. Petersburg Conservatory he became professor of harmony at the new Moscow Conservatory. B. Tchaikovsky was a happily-married family man with a cheerful, self-confident outlook. C. Tchaikovsky, while not a member of the "Russian Five," considered himself Russian, in the fullest sense of the word. D. Tchaikovsky, with elements of French, Italian, and German music as well as Russian folk songs, fused national and international elements to produce intensely subjective and passionate music.