Final answer:
Franz Schubert composed more than 600 songs. He was an influential composer of the art song genre, creating a significant body of work during his brief lifetime.
Step-by-step explanation:
The question asks about the number of songs composed by Franz Schubert. The correct answer to this question is B. 600. Schubert was an Austrian composer who was particularly noted for his genius in the genre of art song, or Lied. During his short life, he was incredibly prolific, composing more than 600 Lieder, along with symphonies, operas, chamber music, and piano works. His songs are admired for their lyrical melodies and their sensitive alliance of music and poetry.