The section fascinated twentieth-century composers so much that they added more new instruments to this section than to any other section in the orchestra. strings brass percussion woodwinds

Percussion is the correct answer.

Explanation:

The orchestra of the twentieth century was a little smaller than the typical Romantic orchestra had been. In this period, the string section of the orchestra lost place to the woodwind and brass sections. Many composers featured the winds rather than the strings in the melody and in key sections of music.

it's d. (also remember it's produced physically,visual effects )

your answer would be d.)