The nurse is caring for an 85-year-old client. For which important factor directly influencing this client's mental health should the nurse be most aware ？（）
A．The client's attitude toward life circumstances.
B．The client's age, education level, social status, and economic level.
C．The number of children and grandchildren in the family and the client's relationship with them.
D．Grief issues related to loss, role changes, and physical stamina.
