All of the above is the answer
Not recognized as a composer Gustav Mahler.
Option A. was not recognized as a composer of any significance.
Encyclopædia Britannica, Inc. Gustav Mahler (born July 7, 1860, in Karishte, Austrian Empire, died May 18, 1911, in Vienna, Austria), Austrian Jewish composer and conductor. Many different strands of romance.
Gustav Mahler was a late Romantic Austrian composer and one of the leading conductors of his generation. As a composer, he acted as a bridge between 19th-century Australian and German traditions and modern times in the early 20th century.
Marler has performed many operas in Vienna and New York City. His inspiration may have been constantly nurtured, but perhaps his conducting schedule was too overwhelming for him to really focus on a full-fledged opera. On the other hand, his symphony is not simple.
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