Your Grandfather Was Diagnosed Alzheimer's Disease Several Years Ago

Your grandfather was diagnosed Alzheimer's disease several years ago.Your mother has been taking care of your grandfather for the past five years,which has been very difficult.As the Alzheimer's disease progressed,she was required to provide more assistance and by the time he died two months ago,he was less and less who he used to be.Your mother's grief for the loss of her father is likely accompanied by ____.

A) severe depression
B) physical and emotional exhaustion
C) regret that she could not have done more
D) relief at having her life back