Please help me with this question ;)

Embellishments area. ornamental tones not printed in the music that seventeenth- and eighteenth-century performers were expected to add to the melody.b. music created at the same time it is performed.c. notes printed in the music that embellish the melodyd. obsolete in contemporary performances

I’m a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.

What caused many of the moai at easter island to be destroyed?