Read the reading below carefully, and then complete it with the best option A, B, C or D given below:
Is the tape-recorded sound of a large metal-stamping machine music? Are 4 minutes (1) ______ 3 seconds of silence music? Is the activity of reading a (2) ______ of hundreds of seemingly unrelated objects, activities, and states of mind music? Each of these “(3) ______” as well as many other sounds (or nonsounds) has been copyrighted (4) ______ a musical composition, performed, and recorded in the 20th century. One of the legacies of 20th-century music is to have blurred the definition of music as (5) ______ before.

Are 4 minutes (1) ______ 3 seconds of silence music?