Answer:
The correct answer is he was strictly only a music composer
Explanation:
Hector Berlioz was a French composer and one of the most important figures of Romanticism. He was born on December 11, 1803, and died in March, 1869.
His works were mainly influenced by literature, as seen in his most famous one, entitled Symphonie Fantastique, and that was composed to honor Emperor Nicholas I of Russia, making options A and C incorrect.
Since he was born in France, he couldn't be one of the early Viennese composer. Letter B is also incorrect since Leipzig Conservatory of Music was founded by Felix Mendelssohn, a German composer and piano player.
On the music field, he was only a music composer, but he was also a famous critic and writer, and that is why Letter D is correct.
