Franz Schubert was a well-known musician in the world. But he lived a very hard life and often went hungry. One day, being very hungry, he went into a small restaurant in Vienna, hoping he might meet some friends there. He looked around and saw nobody he could borrow any money from. Then his eyes fell on a paper on one of the tables. In it was a little poem. He took the paper with the poem. After he composed a piece of music for the poem, he took his work to the owner of the restaurant. He only received a dish of beef and potato for it. thirty years after his death, this manuscript  by Schubert was sold for 40 00c francs. it was his famous berceuse . From the passage we didn't know that  _  .
where Schubert composed his famous berceuse why Schubert composed his famous berceuse whether it was hard for Schubert to make a living who bought his famous berceuse for 40 000 francs
Question: Franz Schubert was a well-known musician in the world. But he lived a very hard life and often went hungry. One day, being very hungry, he went into a small restaurant in Vienna, hoping he might meet some friends there. He looked around and saw nobody he could borrow any money from. Then his eyes fell on a paper on one of the tables. In it was a little poem. He took the paper with the poem. After he composed a piece of music for the poem, he took his work to the owner of the restaurant. He only received a dish of beef and potato for it. thirty years after his death, this manuscript  by Schubert was sold for 40 00c francs. it was his famous berceuse . From the passage we didn't know that  _  .
A. where Schubert composed his famous berceuse
B. why Schubert composed his famous berceuse
C. whether it was hard for Schubert to make a living
D. who bought his famous berceuse for 40 000 francs
Answer: