A) Her sorrow could be traced back to excessive paleness. Eliminate
B) Her face was full of sorrow, but pale as she was, she was somewhat attractive to me.
C) Her face was excessively full of such sorrow, but to my taste she was pale and unpleasing to look at.
D) I was one of the few who could perceive the sorrow she hid from others, yet I could tell it was excessive sorrow because her paleness gave that away.