In what way was franz schubert ahead of his time?   a. he wrote melodies based on the whole-tone scale.   b. he defied the tonal conventions of the sonata form by combining unrelated keys.   c. he pioneered the technique of atonal music.   d. he created the genre of the piano trio. the correct answer is 100% b.

Your answer is correct. Choice B... 

Franz Schubert defied the tonal conventions of the sonata form in his days by combining unrelated keys. Although Schubert was not considered much of a composer in his days, his style later became common and highly celebrated. For this reason, it is said that Franz Schubert was a brilliant composer ahead of his time.