Final answer:
The nurse teaches that feeling sad, guilty, and lonely is a part of the grieving process. Correct option is c.
Step-by-step explanation:
The nurse teaches that feeling sad, guilty, and lonely is a part of the grieving process. This is in line with Kübler-Ross's five stages of grief, which include denial, anger, bargaining, depression, and acceptance.
It is important for the family to understand that these emotions are normal and expected during the grieving process.