realized that a song takes up a lot more space on her computer than the lyrics of the song typed out in an MS Word document. Why does this happen?

A$.$ While storing sound, a computer stores a lot of information $-$ like amplitude and frequency $-$ that it does not while it saves text.

C$.$ Computers save audio and visual data in the form of special characters which take up a lot more space than binary digits.

B$.$ Each binary digit for music takes up a lot more space than that for text.

D$.$ While storing sounds, a computer keeps some amount of memory free to be accessed and used while playing the sound.