Final answer:
Irene is most likely in the depression stage of Elisabeth Kübler-Ross's five-stage model of grief, which consists of denial, anger, bargaining, depression, and acceptance.
Step-by-step explanation:
Irene, a terminally ill cancer patient, who has accepted the certainty of death and spends most of her time crying and grieving while refusing visitors, is most likely in the depression stage of the dying process according to Elisabeth Kübler-Ross's five-stage model of grief. This stage is characterized by resignation and hopelessness after the realization of the inevitable end. Kübler-Ross's model includes the stages of denial, anger, bargaining, depression, and finally, acceptance.
When it comes to the order of stages in Kübler-Ross's model, the correct sequence is c. denial, anger, bargaining, depression, acceptance. It is important to note that these stages may not occur in a linear fashion and not everyone will experience all stages. Additionally, a person's reactions are influenced by their individual experiences, culture, and personal background.