Music appreciationamerican innovations in the arts: the music played during the earliest films (pre-1900)                a.  was played on a phonograph.      b.  conveyed the mood of each scene.      c.  covered the sound of noisy projectors.      d.  introduced characters and themes.

The best answer is B) Conveyed the mood of each scene.

Although music was later played on a phonograph to accompany silent films, the earliest films often included a live orchestra. The music that accompanied the film was intended to help establish the mood of scenes and provide the audience with emotional queues. 

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Is it even part of math