Opera is a large-scale music drama that is sung. It combines singing and instrumental music with poetry, acting, scenery, and costumes.
Many elements of spoken theatre, like scenery, costumes, and acting, are used in opera. However, the importance of song distinguishes opera from other dramatic forms. Almost everything is sung, and the music works in tandem with the singers. An opera, like a play, is performed on stage with outfits, landscapes, makeup, and so on. The plural of the Latin word opus, which means "work," is opera.
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Answer: d. Sounds
Explanation: 
 According to Bruno Netti on Ethnomusicology, Music is diverse. It always expresses a subtext determined by culture, class, gender and personality and by a society's idea of music. Evidenced by the different genres of music we have. 
 Alan Merriam's three part model on music suggests that music is a phenomenon that consists of three sides; sound, behaviour and ideas.
 So therefore for music to be understood, it should be studied as a group of sounds, as behaviour that leads to these sounds, and as a group of ideas or concepts that govern the sound and the behaviour. 
 
        
             
        
        
        
An art movement is a tendency or style in art with a specific common philosophy or goal, followed by a group of artists during a restricted period of time, or, at least, with the heyday of the movement defined within usually a number of years.