According to Freud, What Are the Forces That Lead a Person

According to Freud, what are the forces that lead a person to attempt or commit suicide?

A) A real or symbolic loss leads to a defense mechanism called introjection, and this in turn leads to suicide as an extreme expression of internalized anger and self-hatred.
B) An inability to adequately overcome the Oedipus or Electra complex leads to a longing for an end to life that results in suicidal behaviors.
C) Fixation at the oral stage leads to behaviors that are overly expressive, and thus suicide is the ultimate in "expressive" behaviors.
D) Death is seen as a way of getting in touch with one's own unconscious, and thus it is viewed by the victim as a desirable behavior.