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Compact discs (CDs) have revolutionised the music industry with their surprisingly realistic sandwiches with aluminium at the centre. They have digitally recorded material that is read by laser beams, so the sound does not crackle like of vinyl records. CDs are also virtually indestructible, and they are lighter and smaller than conventional records. Since their introduction, CDs have become more affordable and widely available. In fact, they are now sold in electronics and video stores that did not formerly carry records or cassettes.

There has been a phenomenal growth in the sale of CDs. Sales climbed dramatically during the second half of the 1980s. In the 1990s sales have been even greater CDs have all but replaced records in stores and, in spite of their being less affordable than cassettes, they continue to gain popularity.

The main appeal of CDs in music industry is their:

A)  Price                           

B)  Size

C)  Availability                  

D)  Sound

E)  None of these