The song says about the love of two young students. She is singing the song.

• A. 
  The song which she is singing it says about the love of two young students.
• B. 
  The song she is singing says about the love of two young students.
• C. 
  The song says about the love of two young students which she is singing.
• D. 
  The song says about the love of two young students that she is singing it.