Answer:
i think it's c
Explanation
I'm pretty sure but not positve sorry if it's wrong :3
Letter c should be your answer. Hope you do good
I think the answer is 20 but I am not sure,I heard about 15 and 25
It starts slowly, with only a few instruments. Gradually speeds up the tempo, gradually gets louder, adding more instruments....but the same tune is repeated over and over again. The single the,e achieves unity. The tempo and dynamic changes (Loudness, speed) give is the variety.