Rewrite these sentences using relative clauses:

This is the song. My sister used to listen to it in the 1990s.

A. This is the song which my sister used to listen to in the 1990s

B. This is the song when my sister used to listen to in the 1990s

C. This is the song which my sister used to listen to it in the 1990s

D. This is the song whom my sister used to listen to in the 1990s