Although Grieving Is Considered a Normal Process,it Does Sometimes Become

Although grieving is considered a normal process,it does sometimes become a psychological disorder.Which of the following cases would NOT be diagnosed as complicated grief?

A) Mr. A's sister suddenly passed away from illness about a year ago. Mr. A is still suffering from severe depression and persistent thoughts of joining his sister in heaven.
B) Miss B has experienced the death of a close friend. She is so depressed that she has no appetite or energy, and believes that she will never be truly happy again without her friend.
C) Mrs. C's dog recently died. Three weeks later, her friends suggest that she get another dog "to help her get over the loss." Mrs. C refuses, saying she just isn't ready to get another dog and still has trouble accepting that "Duchess" is gone.
D) Dr. D's cate died 6months ago. In addition to his depressive symptoms, he cannot stop replaying the scene of her death in his mind, which is interfering with his social life.