Final answer:
The primary determinant of retirees' life satisfaction is financial security and good health, as they allow retirees to maintain a comfortable lifestyle and engage in meaningful activities.
Step-by-step explanation:
The major determinant of retirees' life satisfaction is B) financial security and good health. Studies indicate that having sufficient financial resources and being in good health are critical aspects that contribute significantly to the well-being and happiness of retirees. Financial security allows for a comfortable lifestyle without the stress of running out of money, which is a common concern among retirees. Good health, on the other hand, not only increases the quality of life but also offers the possibility to engage actively in various activities post-retirement, which may include part-time employment, hobbies, or volunteering. While relationships, such as having a spouse and engaging in volunteer work, do play roles in life satisfaction, financial and health stability remain the central pillars for a fulfilling retirement.